a) 2x-y^2+3y^2-x+x^2= x+2y^2+x^2
b) 3+5a-2a-5b^2-3= 3a-5b^2
c)-4a^2+a-b^2-2a-a+2b^2= -2a-4a^2+b^2
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a) 2x-y^2+3y^2-x+x^2= x+2y^2+x^2
b) 3+5a-2a-5b^2-3= 3a-5b^2
c)-4a^2+a-b^2-2a-a+2b^2= -2a-4a^2+b^2