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3x + 20
10x + 5 - 12x + 24
-2x + 29
berarti menjadi 2(3x+7)-3(x-2) =6×+14-3×+6=
6×-3×+14+6 =3×+20
b.5(2x+1)dari3(4x-8)
berarti menjadi 3(4x-8)-5(2x+1) (posisinya dibalik)
12×-24-10×-5=12×-10×-8-5= 2×-13