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/*12
1 - 3 + x = -2 - y
x + y = -2 - 1 + 3
3(x+2) - 4(3-y) = 3
x + y = 0
3x + 6 - 12 + 4y = 3
x + y = 0
3x + 4y = 3 - 6 + 12
y = 0 - x
3x + 4y = 9
y = 0 - x
3x + 4(0-x) = 9
y = 0 - x
3x + 0 - 4x = 9
y = 0 - x
3x - 4x = 9
y = 0 - x
-x = 9 /*(-1)
y = 0 - x
x = -9
y = 0 - (-9)
x = -9
y = 0 + 9
x = -9
y = 9
x = -9