упростить выражения.
а. 5у-(у+2)-4*(у-7)+у=
18+(а+9)-5*(а-2)+15а=
4х-(х+2)-7*(х-1)-х=
б. 7,8-3с-(-9с)+1,5с=
-(2,1с-4)+2,5с-8,1с=
-1,2х+3*(2-х)-(х-4)
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