please help me by solving these sums step-by-step..................and gain 15 points....
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4.(x+4) because 19x+84
=19× x+4 ×21
(x-3) because x³-6x²
=x×x× x-3 ×2x²
(x-7) because -19x+84
=19x-84
=19× x-7 ×12
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