630:X+80=150 40*X-90=350

Question

630:X+80=150 40*X-90=350

Answer 1

630:х=150-80
630:х=70
х=630:70
х=9
---------------------------
630:9+80=150
150=150



40х=350+90
40х=440
х=440:40
х=11
----------------------------
40*11-90=350
350=350