a)12-(3x^2+5x)+(-8x+3x^2)=0
б)(2y^3+3y^2-7)-(5+y^3+3y^2)=3y^3+y-5y
в)4n(n-1)-3n(2n+4)+2n(n-2)=0
г) 3n(n-2)-4n(2n+3)+5n(n+2)=1
д)3x(2x+1)-x(6x-1)=10
е)х(4x-2)-2x(2x+4)=4
плиз!
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