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4x2+x-7x2-14x=24x-3x2+6
-37x-6=0
-37x=6
x=-6/37
(x+y)/2+(x-y)/3=6 |*6
(x+y)/4-(x-у)/3=6 |*12
3(x+y)+2(x-y)=36
3(x+y)-4(x-у)=72
3х+3у+2х-2у=36
3х+3у-4х+4у=72
5х+у=36
-х+7у=72
у=36-5х
-х+7(36-5х)=72
-х+252-35х=72
-36х=72-252
-36х=-180
х=-180:(-36)
х=5
у=36-5х
у=36-5*5=36-25=11
Ответ: х=5; у=11
Х²-10х+25-10х-х²=25-20х
25-20*(-1/20)=25-(-1)=26