6 Subtract −2y2+2x2y2+3xy−4xy2 from the sum of −8y2−3x2y2+10xy−6xy2 and −4x2y2−7xy+4y2−2xy2 7 Add −23a2b−34ab2+32a+112ab and 112a2b−4ab2+12a−12ab 8 Add 5114xy+1715xy2−32x2y2 and −76xy−1260xy2+17x2y2 9 Subtract74x3+35x2 +12x+92from 72−x3−x25 10 Add 12x2y2+34xy2−27x2y−8xy and 2x2y2−14xy2+37x2y+18xy