Question

1)15x+4=7x+20 2)8-5x = 13 - 3x​

Answer 1

№1

15х + 4 = 7х + 20

15х - 7х = 20 - 4

8х = 16

х = 16 : 8

х = 2

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15 · 2 + 4 = 7 · 2 + 20

30 + 4 = 14 + 20

34 = 34

№2

8 - 5x = 13 - 3x

-5х + 3х = 13 - 8

-2х = 5

х = 5 : (-2)

х = -2,5

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8 - 5 · (-2,5) = 13 - 3 · (-2,5)

8 + 12,5 = 13 + 7,5

20,5 = 20,5