Question

resolva as euqaçoes abaixo:
x-3=9

x+5=20-4×

9x-4×-7×=-10-30​

Answer 1

1) x - 3 = 9

x = 9 + 3

x = 12

2) x + 5 = 20 - 4x

4x + x = 20 - 5

5x = 15

x = 15/5

x = 3

3) 9x - 4x - 7x = -10 - 30

-20x = -40

x = -40/-20

x = 2

Answer 2

1) x - 3 = 9

x = 9 + 3 *x = 12*



2) x + 5 = 20 - 4x

x + 4 x = 20 - 5

5x = 15

x = 15/5 *x = 3*



3) - 9x - 4x - 7x = - 10 - 30

- 2x = - 40

x = - 40/ - 2 *x = 20*