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= 7x-5x+4+2-3-2
= 2x+6-5
= 2x+1
b). 8x+5(x+1) = 3(2x-3)+4(x+2) => 8x²+8x+5x+5 = 6x-9+4x+8
=8x²+13x-10x+5+1
= 8x²+3x+6