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y-13 = (-5/6)*(x-4) // - (-5/6)*(x-4)
y-((-5/6)*(x-4))-13 = 0
(5/6)*(x-4)+y-13 = 0
5/6*(x-4)+y-13 = 0
5/6*(x-4)+y-13 = 0
5/6*x+y-13-10/3 = 0
5/6*x+y-49/3 = 0
5/6*x+y-49/3 = 0
5/6*x+y-49/3 = 0 // - y-49/3
5/6*x = -(y-49/3) // : 5/6
x = (-(y-49/3))/5/6
x = 6/5*(49/3-y)
x = 6/5*(49/3-y)
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