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12x - 9x = 3x
6y + 8y =14y
2.3x-3y=3(x-y)
3.2x+6=2x+2.3=2(x+3)
4.ab+bc=b(a+c)
5(2x+5)-(x-3)=2x+5-x+3=x+8
6.(5a-6+ab)-(a+2ab-1)=5a-6+ab-a-2ab+1=4a-5-ab
7. 10 kurangnya dari suatu persegi adah 111 persegi
= x-10:111
8.-2(x+4)=-2x-4
9.5(3x+2y)=15x+10y
10.-3(a-2b)=-3a+2b