15 ×(c - 8x )равно 75 при c равно 53

1) 53 - 8x = 5

2) -8x = 5 - 53

3) -8x = -48

4) x = -48 : (-8)

5) x = 6

15×(с-8х) =75

15×(53-8х) =75

795-120х=75

-120х=75-795

-120х=-720

х=6