Question

a) 2.( x - 3 ) = 14
b) 2.( x - 7 ) = 3x + 5
c) 3x - 2.( x - 9 ) = 12
d) 7. ( x - 4 ) = 2x + 7

Answer 1

Explicação passo-a-passo:

a)2.(x-3)=14

2x-6=14

2x=14+6

2x=20

x=20/2

x=10

b)2.(x-7)=3x+5

2x-14=3x+5

2x-3x=5+14

-x=19

x=-19

c)3x - 2.( x - 9 ) = 12

3x-2x+18=12

x=12-18

x=-6

d)7. ( x - 4 ) = 2x + 7

7x-28=2x+7

7x-2x=7+28

5x=35

x=35/5

x= 7