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y-80 = -((21/2)*(x+0)) // + (21/2)*(x+0)
(21/2)*(x+0)+y-80 = 0
(21/2)*x+y-80 = 0
21/2*x+y-80 = 0 // - y-80
21/2*x = -(y-80) // : 21/2
x = (-(y-80))/21/2
x = 2/21*(80-y)
x = 2/21*(80-y)
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