Question

respondam essas perguntas por favor!

a) 2 x + 2 ( x + 1 ) = 2 ( x + 7 ) - 2

b) 3 ( x + 3 ) + 4 ( x - 2 ) = 7

Answer 1

Oi...

a)

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

2x + 2x + 2 = 2x + 14 - 2

4x + 2 = 2x + 12

4x - 2x = 12 - 2

2x = 10

x = 10/2

x = 5

b)

3(x + 3) + 4(x - 2) = 7

3x + 9 + 4x - 8 = 7

7x  + 1 = 7

7x = 7 - 1

7x = 6

x = 6/7

Espero ter ajudado.