Question

Resolva as seguintes equações
A)5×-15=2+9
B)4.(×-5)+3=2.(5+×)-7
C)5.(3×-7)=8.(×+7)+21​

Answer 1

A)

5x - 15= 2 + 9

5x= 2 + 9 + 15

5x= 36

x= 36/6

x= 6

B)

4(x - 5) + 3= 2(5 + x) - 7

4x - 20 + 3= 10 + 2x - 7

4x - 2x= 10 - 7 + 20 - 3

2x= 20

x= 20/2

x= 10

C)

5(3x - 7)= 8(x + 7) + 21

15x - 35= 8x + 56 + 21

15x - 8x= 56 + 21 + 35

7x= 112

x= 112/7

x= 16