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b)3(x+2y-6)=3x+6y-18
c)-2(x+4-y+z)=-2x-8+2y-2z
d)x(2y-54)=2yx-54x
e)x(2x²-x+7)=2x³-x²+7x
f)a(b+a-ab)=ab+a²-a²b
a)2a(b-3)-2b(a-3)=2ab-6a-2ba+6b
b)a(a+b)+a(a-b)+b(b+a)+b(b-a)=a²+ab+a²-ab+b²+ba+b²-ba=2a²+2b²
c)5a(a-2)+2a(a+5)=5a²-10a+2a²+10a=7a²
8a+4b/4=2a+b
9a+6/3=3a+2
5(a+b)-(b-a)/2=5a+5b-b+a/2=6a+4b/2=3a+2b