Zapisz w najprostszej postaci :
a)7x^2-4x-6x^2+4-x^2+5x=
b)-2(3a-2b)-4a(2-3a+2b)=
c)(4-x)(2x+5)-4=
d)(4-2x)(3x-3)-2x(3x+1)=
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a)x+4
b)-6a+4b-8a+12a^2-8ab=-22a-4b+12a^2
c)8x-2x^2+20-5x-4=3x-2x^2+16
d)12x-6x^2-12+6x-6x^2+2x=20x-12x^3-12