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y-12 = (7/200)*(x-500) // - (7/200)*(x-500)
y-((7/200)*(x-500))-12 = 0
(-7/200)*(x-500)+y-12 = 0
y-7/200*(x-500)-12 = 0
y-7/200*(x-500)-12 = 0
y-7/200*x-12+35/2 = 0
y-7/200*x+11/2 = 0
y-7/200*x+11/2 = 0
y-7/200*x+11/2 = 0 // - y+11/2
-7/200*x = -(y+11/2) // : -7/200
x = (-(y+11/2))/(-7/200)
x = 200/7*(y+11/2)
x = 200/7*(y+11/2)
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