Efectuați ,reducând termeni asemenea :
c) (2a+3)+(2a-3)-(2a+1)-(-3+2);
d)(2x+3y)+(-4x+5y-1)-(-3x+8y-4)
e) x³-5x²+2x-7-(x³+4x-1)+(x²+6x+2);
h) (-2x²+x-5)-(-x²+3x-2)+(x²-x-9); va rog ​