7 5 y 7. 6y(2x-5)+x(2x-5). Y=2x-5 6x+7. 6x−7y2x−5y. Y=2x+5. 2x-x^2=7. 9y5/5x3*10x5/21y7 решение. 14x+7x2. 5(3x+4)-2x=7. -(Х+1)=-2 1/3. 1/2+1/5. 1.5 Х-2у-1.5(-1.7)-2*0.3. 4х2,5. Y-5/9y 3.6. 3x+y=12. -3y-9y=5y. -3x+5y=-9. 7-3(Х-2)=5-2х. 7у-7х:у^2-х^2. 5х+7>3(2х-5)-х