Решите уравнение а) 5y + ( 8y+9)=100; б) x-( 50-x)=12; в) ( 18-3x)-(4+2x)=-6; г) x+(x+1)+(x+2)=9; д) (z-2)+(z-1)+z=-3; е) 21+(20-4x)-(11-2x)=0.
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13y=100-9
13y=91
y=91/13
y=7
в)14-1x=-6
-1x=-6+14
-1x=-20
x=-20/-1
x= - 20
е) 41-4x-11-2x=0
41-11=4x+2x
30=2x
x=30/2
x=15