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y-4 = (-3/4)*(x-5) // - (-3/4)*(x-5)
y-((-3/4)*(x-5))-4 = 0
(3/4)*(x-5)+y-4 = 0
3/4*(x-5)+y-4 = 0
3/4*(x-5)+y-4 = 0
3/4*x+y-4-15/4 = 0
3/4*x+y-31/4 = 0
3/4*x+y-31/4 = 0
3/4*x+y-31/4 = 0 // - y-31/4
3/4*x = -(y-31/4) // : 3/4
x = (-(y-31/4))/3/4
x = 4/3*(31/4-y)
x = 4/3*(31/4-y)
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