Question

10) Calcule o valor de x nas equações a seguir:
a) 4(x + 10) - 2(x - 5) = 0
b) 3(2x + 3) = -4(x - 1) +3
c) 7(x - 1) - 2(x - 5) = X - 5
d) 2(3 - x) = 3(x - 4) + 15
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Answer 1

a)

4(x + 10) - 2(x - 5)= 0

4x + 40 - 2x + 10= 0

4x - 2x= 0 - 40 - 10

2x= - 50

x= - 50/1

x= - 25

b)

3(2x + 3)= - 4(x - 1) + 3

6x + 9= - 4x + 4 + 3

6x + 4x= 4 + 3 - 9

10x= - 2

x= - 2/10

x= - 1/5

c)

7(x - 1) - 2(x - 5)= x - 5

7x - 7 - 2x + 10= x - 5

7x - 2x - x= - 5 + 7 - 10

4x= - 8

x= - 8/4

x= - 2

d)

2(3 - x)= 3(x - 4) + 15

6 - 2x= 3x - 12 + 15

- 2x - 3x= - 12 + 15 - 6

- 5x= - 3>> .(-1)

5x= 3

x= 3/5

Answer 2

Explicação passo-a-passo:

a) 4(x + 10) - 2(x - 5) = 0

4x + 40 - 2x + 10 = 0

2x + 50 = 0

2x = - 50

x = - 25