Question

A)5×+2=-×+38
B)12×+15=4×-9
C)13+2×=- 7×-2
D)5 (×+2)-3=2 (2×+4)+3
E)3 (5+2×)-5=2 (2×+4)-2
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Answer 1

a) 5x +x = 38 - 2
6x = 36
x = 6

b) 12x - 4x = -9 -15
8x = -24
x = - 3

c) 2x + 7x = -2 -13
9x = -15
x = -15/9 ou -5/3

d) 5x + 10 -3 = 4x + 8 + 3
5x + 7 = 4x +11
5x -4x = 11 -7
x = 4

e) 15 + 6x -5 = 4x + 8 -2
10 +6x = 4x +6
6x -4x = 6 -10
2x = -4
x = -2

Answer 2

Olá

a) 5x + 2 = - x + 38

5x + x = 38 - 2

6x = 36

x = 36/6

x = 6

b) 12x + 15 = 4x - 9

12x - 4x = - 9 - 15

8x = - 24

x = - 24/8

x = - 3

c) 13 + 2x = - 7x - 2

2x + 7x = - 2 - 13

9x = - 15

x = - 15/9

x = - 5/3

d) 5(x + 2) - 3 = 2( 2x + 4) + 3

5x + 10 - 3 = 4x + 8 + 3

5x - 4x = 8 + 3 + 3 - 10

x = 4

e) 3( 5 + 2x) - 5 = 2(2x + 4) - 2

15 + 6x - 5 = 4x + 8 - 2

6x - 4x = 8 - 2 + 5 - 15

2x = - 4

x = - 4/2

x = - 2

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