1) 5 - x/7 = 4
2) x/2 - x/4 + 7 = x/8 - x/6 + 21/2
3) 3x/4 - 1/5 + 2x = 5x/4 - 3x/20
4) 2x/5 + 2/3 = 3x/6 + x/2
5) x+10/8 = 3
6) x-1/2 = x+1/3
7) 3x-8/5 - x-1/4 + 7-x/3 = 8-2x - 8-5x/10
8) 2x-5/3 = 3-x + 3x-2/5
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Respostas
1) 5 - x/7 = 4
35 - x = 28
-x = 28 - 35
-x = -7
x = 7
2) x/2 - x/4 + 7 = x/8 - x/6 + 21/2
12x - 6x + 168 = 3x = 4x + 252
6x + 168 = -x + 252
6x + x = 252 - 168
7x = 84
x = 84/7
x = 12
3) 3x/4 - 1/5 + 2x = 5x/4 - 3x/20
15x - 4 + 40x = 25x - 3x
55x - 4 = 22x
55x - 22x = 4
33x = 4
x = 4/33 = 0,12
4) 2x/5 + 2/3 = 3x/6 + x/2
12x + 20 = 15x + 15x
12x + 20 = 30x
12x - 30x = -20
-18x = -20
18x = 20
x = 20/18
x = 10/9 = 1,1
5) x+10/8 = 3
x + 10 = 24
x = 24 - 10
x = 14
6) x-1/2 = x+1/3
3(x-1) = 2(x+1)
3x - 3 = 2x + 2
3x - 2x = 2 + 3
x = 5
7) 3x-8/5 - x-1/4 + 7-x/3 = 8-2x - 8-5x/10
12(3x-8) - 15(x-1) + 20(7-x) = 480 - 120x - 6(8+5x)
36x - 96 - 15x + 15 + 140 - 20x = 480 - 120x + 48 + 30x
x + 59 = 432 - 90x
x + 90x = 432 - 59
91x = 373
x = 373/91 = 4,098901
8) 2x-5/3 = 3-x + 3x-2/5
5(2x-5) = 45 - 15x + 3(3x-2)
10x - 25 = 45 - 15x + 9x - 6
10x - 25 = 39 - 6x
10x + 6x = 39 + 25
16x = 64
x = 64/16
x = 4