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x*(y-3)
y*(9x-1)
b*(a+3b)
bc-bd=b(c-d)
xy-3x=x(y-3)
9xy-y=y(9x-1)
ab + 3b²=b(a+3b)
a) bc-bd=b(c-d)
b) xy-3x=x(y-3)
c) 9xy-y=y(9x-1)
d) ab + 3b² =b(a+3b)