b)-2(3a-2b)-4a(2-3a+2b)=
c)(4-x)(2x+5)-4=
d) (4-2x)(3x-x)-2x(3x+1)
a )7x^2 - 4x - 6x^2 + 4 - x^2 + 5x= xb) -6a+4b -8a+12a^2-8ab=12a^2 -8ab -14a +4bc) 8x +20 -2x^2 +3x - 4 = -2x^2 -5x +16d) 8x -4x^2 - 6x^2 -2x = -10x^2 +6x
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a )7x^2 - 4x - 6x^2 + 4 - x^2 + 5x= x
b) -6a+4b -8a+12a^2-8ab=12a^2 -8ab -14a +4b
c) 8x +20 -2x^2 +3x - 4 = -2x^2 -5x +16
d) 8x -4x^2 - 6x^2 -2x = -10x^2 +6x