(x-6)²=(7-x)²
x²-12x+36=49-14x+x²
x²-x²-12x+14x=49-36
2x=13
x=6.5
18x^2 + 3x + 12x + 2 = 18x^2 - 2x + 45x - 5 - 3x
15x + 2 = 40x - 5
-25x = -7
x = 7/25 = 0.28
7х-3у=13 7*(5+2у)-3у=13 35+14у-3у-13=0 11у=-22 у=(-2)
х=5+2у ---------------------- ....................... .................
у=-2
х=5+2*(-2) х= 1 Ответ (1;-2)
х=6-у
3*(6-у)-5у-2=0 18-3у-5у-2=0 16=8у у=2
х=6-2=4
Х^2+6x+9=x^2-10x+25
16x=16
x=1