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2(7x+5)-6(x-2)= 14x+10-6x+12 = 8x+22
b)
5(3-2x)-(4x+6)*3 = 15-10x-12x+18 = -22x+33
c)
x(x²+2x+1)-(-4x³+8x²-6):2 = x³+2x²+x+2x³-4x²+3 = 3x³-2x²+x+3
b)5(3-2x)-(4x+6)*3=15-10x-12x-18=-22x-3
c) x(x2+2x +1) -(-4x3+8x2-6):2= x3+2x2+x+2x3-4x2+3=3x3-2x2+x+3