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y-20 = (20/3)*(x-10) // - (20/3)*(x-10)
y-((20/3)*(x-10))-20 = 0
(-20/3)*(x-10)+y-20 = 0
y-20/3*(x-10)-20 = 0
y-20/3*(x-10)-20 = 0
y-20/3*x-20+200/3 = 0
y-20/3*x+140/3 = 0
y-20/3*x+140/3 = 0
y-20/3*x+140/3 = 0 // - y+140/3
-20/3*x = -(y+140/3) // : -20/3
x = (-(y+140/3))/(-20/3)
x = 3/20*(y+140/3)
x = 3/20*(y+140/3)
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