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(a+b)* (-4)=-4*2+(-4)*b=-4a-4b
-3(3x-2)=-3*3x-2*(-3)=-9x+6
-(3x-y+2)=-3x+y-2
(10x-2y):2=5x-y
(24a-4b): (-8)=-3a+1/2b
(4y-6b):(-1/2)=-2y+3b
takie trudne?