25*x=20*5. X-510=90*4

Question

25*x=20*5. X-510=90*4

Answer 1

25x=100
x=100/25
x=4

x-510=360
x=360=510
x=870

Answer 2

25*x=20*5

25х=100

х=100:25

х=4

X-510=90*4

х=360+510

х=870