Question

2.RESOLVA AS EQUAÇÕES: a) 7x + 5 = 68 - 2x b) 7x -9 = 2x + 11 c) 2(7x - 6) + 12(x - 3) = 30 d) 3(2x - 5) = 9 - 2x e) 4(2x - 3) = 5( x + 3) me ajuda por favor​

Answer 1

Resposta:

a) 7x + 5 = 68 - 2x

7x +2x=68-5

9x=63

X= $\frac{63}{9}$= 7

b) 7x -9 = 2x + 11

7x-2x=11+9

5x=20

X=$\frac{20}{5}$= 4

c) 2(7x - 6) + 12(x - 3) = 30

14x-12+12x-36=30

14x+12x=30+12+36

26x=78

X=$\frac{78}{26}$= 3

d) 3(2x - 5) = 9 - 2x

6x-15=9-2x

6x+2x=9+15

8x=24

x=$\frac{24}{8}$= 3

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

8x-12=5x+15

8x-5x=15+12

3x=3

X= 1