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(2x+8)+(4x-5-5y)=2x+4x-5y+8-5=6x-5y+3
(3p+q)+(-2p-5q+7)=3p-2p+q-5q+7=p-4q+7
(3x²+2x-1)+(x²-5x+6)=3x²+x²+2x-5x-1+6=4x²-3x+5
2(x+2y-xy)+5(2x-3y+5xy)=2x+4y-2xy+10x-15y+25xy=2x+10x+4y-15y-2xy+25xy=12x-11y-23xy
Semangat!