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x+y/3 -x=2
3*2x -3*y - 2*x + (-2)*2y = 7
(x+y)/3 - x = 2
6x -3y -2x -4y = 7
x+y = (2+x)*3
4x-7y=7
x+y =6+3x
4x-7y=7
y=6+2x
Teraz podstawiamy do górnego równania:
4x-7(6+2x)=7
4x -42 - 14x = 7
4x - 14x = 7+42
-10x = 49
x = -4,9
y = 6 + 2*(-4,9)
y = 6 - 9,8 = -3,8