Question

решите уравнение
-15x+31=-7+4x
7(2+y)-3y=5y-6
2(4-9d)-(2d+3)=-8(4-d)+3(1+2d)

Answer 1

-15x+31=-7+4x
-15x-4x=-7-31
-19х=-38
 х=2


7(2+y)-3y=5y-6
14+7у-3у=5у-6
7у-3у-5у=-14-6
-у=-20
у=20


2(4-9d)-(2d+3)=-8(4-d)+3(1+2d)
8-18d-2d-3=-32+8d+3+6d
-18d-2d-8d-6d=-32+3-8+3
-34d=-34
d=1