(8х²-12х+4)-(2х²+5х-2)=8х²-12х+4-2х²-5х+2=6х²-17х+6=0
(11+2х)+(-х²+12х-35)=11+2х-х²+12х-35=-х²+14х-24=х²-14х+35
(7а²-3а+6)-(-8а+2а³+5)=7а²-3а+6+8а-2а³-5=7а²-2а³+5а+1
или вдруг допущена ошибка не 2а³,а 2а²,то
(7а²-3а+6)-(-8а+2а²+5)=7а²-3а+6+8а-2а²-5=5а²+5а+1
(14ху-2у²+13х²)-(-16у²-5ху+4х²)=14ху-2у²+13х²+15у²+5ху-4х²=19ху+13у²+9х²
(18а²b+9ab-2ab²)+(4ab+2ab²)=18a²b+9ab-2ab²+4ab+2ab²=18a²b+13ab
(3/14x²y³-5/8x²y)-(-3/12x²y-4/35x²y³)=3/14x²y³-5/8x²y+3/12x²y+4/35x²y³=3/14x²y³+4/35x²y³-5/8x²y+3/12x²y=105/490x²y³+56/490x²y³-60/96x²y+24/96x²y=161/490x²y³-36/96x²y=23/70x²y³-3/8x²y