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(10*y-11.5)/8 = x // - x
(10*y-11.5)/8-x = 0
(10*y-11.5)/8+(8*(-x))/8 = 0
8*(-x)+10*y-11.5 = 0
10*y-8*x-11.5 = 0
(10*y-8*x-11.5)/8 = 0
(10*y-8*x-11.5)/8 = 0 // * 8
10*y-8*x-11.5 = 0
10*y-8*x-11.5 = 0 // - 10*y-11.5
-8*x = -(10*y-11.5) // : -8
x = (-(10*y-11.5))/(-8)
x = (11.5-(10*y))/(-8)
x = (11.5-(10*y))/(-8)
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