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(1/11)*x+(3/11)*x+(9/13)*y-((2/13)*y) = 0
(1/11)*x+(3/11)*x+(9/13)*y+(-2/13)*y = 0
4/11*x+7/13*y = 0 // - 7/13*y
4/11*x = -(7/13*y) // : 4/11
x = (-(7/13*y))/4/11
x = -77/52*y
x = -77/52*y
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