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(4/5)*x-((11/20)*x)+(5/6)*y-((8/15)*y) = 0
(4/5)*x+(-11/20)*x+(5/6)*y+(-8/15)*y = 0
1/4*x+3/10*y = 0 // - 3/10*y
1/4*x = -(3/10*y) // : 1/4
x = (-(3/10*y))/1/4
x = -6/5*y
x = -6/5*y
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