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(-8/7)*(x-20) = y-45 // - y-45
(-8/7)*(x-20)-y+45 = 0
45-8/7*(x-20)-y = 0
45-8/7*(x-20)-y = 0
160/7-8/7*x-y+45 = 0
475/7-8/7*x-y = 0
475/7-8/7*x-y = 0
475/7-8/7*x-y = 0 // - 475/7-y
-8/7*x = -(475/7-y) // : -8/7
x = (-(475/7-y))/(-8/7)
x = -7/8*(y-475/7)
x = -7/8*(y-475/7)
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