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x+5 7-x
= (7-x)(x-7)+(x+5)(x+5)
(x+5)(x-7)
= 7x-49-x²-7x+x²+5x+5x+25
x²-7x+5x-35
=-x²+x²+7x-7x+5x+5x-49+25
x²-2x-35
= 2x²+10x-24
x²-2x-35
itu saja yang saya tau