(920-x):20+25=63 как а

1) (920-x) : 20+25=63
(920-x) : 20 =63 -25
(920-x) : 20 =38
(920-x) = 38*20
920-x = 760
х = 920 - 760
х= 160
2) (150 : у+7)*40=480
(150 : у+7) =480 : 40
150 : у+7 = 12
150 : у = 12 -7
150 : у = 5
у = 150 :5
<span>у = 30

</span>