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(2x-2)(x+5)
= 2x^2 + 10x - 2x - 10
= 2x^2 + 8x - 10
sederhanakan
= x^2 + 4x - 5
b
5x^2(6x-3y)
30x^3 - 15yx^2
sederhanakan
2x^3 - yx^2