Question

Preciso das respostas: da E até a R, com resolução

Answer 1

Mds Quanta Conta '-'

e)7(x -4) = 2x -3
7x -28 = 2x -3
7x -2x = -3 +28
5x = 25
x = 25/5
x = 5

f)3(x -2) = 4(3 -x)
3x -6 = 12 -4x
3x +4x = 12 +6
7x = 18
x = 18/7

g)3(3x -1) = 2(3x +2)
9x -3 = 6x +4
9x -6x = 4 +3
3x = 7
x = 7/3

h)7(x -2) = 5(x +3)
7x -14 = 5x +15
7x -5x = 15 +14
2x = 29
x = 29/2

i)3(2x -1) = -2(x +3)
6x -3 = -2x -6
6x +2x = -6 +3
8x = -3
x = -3/8

j) 5x -3(x +2) = 15
5x -3x -6 = 15
2x = 15 +6
2x = 21
x = 21/2

k)2x +3x +9 = 8(6 -x)
5x +9 = 48 -8x
5x +8x = 48 -9
13x = 39
x = 39/13
x = 3

l)4(x +10) -2(x -5) = 0
4x +40 -2x +10 = 0
4x -2x = -40 -10
2x = -50
x = -50/2
x = -25

m)3(2x +3) -4(x -1) = 3
6x +9 -4x +4 = 3
6x -4x = 3 -9 -4
2x = 3 -13
2x = -10
x = -10/2
x = -5

n)7(x -1) -2(x -5) = x -5
7x -7 -2x +10 = x -5
7x -2x -x = -5 -10 +7
5x -x = -15 +7
4x = -8
x = -8/4
x = -2

o)2(3 -x) = 3(x -4) +15
6 -2x = 3x -12 +15
-2x -3x = -12 +15 -6
-5x = -18 +15
-5x = -3(-1)
5x = 3
x = 3/5

p)3(5 -x) -3(1 -2x) = 42
15 -3x -3 +6x = 42
-3x +6x = 42 +3 -15
3x = 45 -15
3x = 30
x = 30/3
x = 10

q)(4x +6) -2x = (x -6) +10 +14
-8x -12x = 10x -60 +14
-8x -12x -10x = -60 +14
-30x = -60 +14
-30x = -46(-1)
30x = 46
x = 46/30

r)(x -3) - (x +2) +2(x -1) -5 = 0
x -3 -x -2 +2x -2 -5 = 0
x -x +2x = -3 -2 -2 -5
2x = -12
x = -12/2
x = -6