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56-32y-28y-7+40y-5=19 /-44
-20y=-25 /:-20
y=⁵/₄=1¹/₄
3x²-(3x+2)(x-1)=8
3x²-3x²-3x+2x-2=8
-x=10 / *-1
x= -10
56-32y-28y+7+40y-5=19
-32y-28y+40y=19-56-7
-20y=-44I/(-20)
y=2 4/20=21/5