Respostas
a) x - 3 = 5
x = 5 + 3
x = 8
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b) x + 2 = 7
x = 7 - 2
x = 5
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c) ?
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d) x - 7 = - 7
x = -7 + 7
x = 0
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e) x - 109 = 5
x = 5 + 109
x = 114
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f) 15 = x + 1
15 - 1 = x
14 = x
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g) ?
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h) 0 = x + 12
0 - 12 = x
-12 = x
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i) -3 = x + 10
-3 - 10 = x
-13 = x
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j) ?
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k) ?
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l) 3x = 12
x = 12 / 3
x = 4
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m) 6x - 4 = 2x + 8
6x - 2x = 8 + 4
4x = 12
x = 12 / 4
x = 3
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n) 17x - 2 + 4 = 10 + 5x
17x - 5x = 10 + 2 - 4
12x = 12 - 4
12x = 8
x = 8 / 12
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o) 4x - 10 = 2x + 2
4x - 2x = 2 + 10
2x = 12
x = 12 / 2
x = 6
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p) 5x + 6x - 16 = 3x + 2x - 4
5x + 6x - 2x - 3x = -4 + 16
11x - 5x = 12
6x = 12
x = 12 / 6
x = 2
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q) 5 (2x - 4) = 7 (x + 1) - 3
10x - 20 = 7x + 7 - 2
10x - 7x = 7 - 2 + 20
3x = 25
x = 25 / 3
x = 8,333...
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r) 4 (x + 3) = 1
4x + 12 = 1
4x = 1 - 12
4x = -11
x = -11 / 4
x = -2,75