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-2(x-y)+3y=-2x+2y+3y=-2x+5y
2+3(x-2)=2+3x-6=3x-4
-3(x+2y)-4(-y-7)+(-3)(4x-2y+1)=-3x-6y+4y+28-12x+6y-3=-15x+4y
-2(x-y)+3y=-2x+2y+3y=5y-2x
2+3(x-2)=2+3x-6=3x-4
-3(x+2y)-4(-y-7)+(-3)(4x-2y+1)=-3x-6y+4y+28-12x+6y-3=
=3x-14y+25