Question

7)15=×-20

8)8=×-40

.9)8=×+7

10)×-2=20

11)40+×=5-3×

12)4×=28​

Answer 1

Explicação passo-a-passo:

7) 15 = x -20

15 +20 = x

x= 35

8) 8 = x - 40

8 +40 = x

x = 48

9) 8 = x +7

8 - 7 = x

x = 1

10) x - 2 = 20

x = 20 +2

x = 22

11) 40 + x = 5 -3x

x +3x = 5 - 40

4x = - 35

x = -35/4

12) 4x = 28

x = 28/4

x = 7