10-4(2x+5)=6y-13
4y-63=5(4x-2y)+2
4y-63-20x+10y-2=0
14y-65-20x=0
x=0.7y-3.25
3-8x-6y=0
3-8*(0.7y-3.25)-6y=0
3-5.6y+26-6y=0
29-11.6y=0
y=29/11.6y=2.пятых
14*2.5-65-20x=0
-30-20x=0
x=-30/20
x=-1.5
2x+5y=62 как то так
х=19-y
2*(19-y)+5y=62
38-2y+5y=62
38+3y=62
3y=62-38
3y=24
y=8 8*5=40
x=19-8=11*2=22