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y-6 = (-3/4)*(x-12) // - (-3/4)*(x-12)
y-((-3/4)*(x-12))-6 = 0
(3/4)*(x-12)+y-6 = 0
3/4*(x-12)+y-6 = 0
3/4*(x-12)+y-6 = 0
3/4*x+y-9-6 = 0
3/4*x+y-15 = 0
3/4*x+y-15 = 0
3/4*x+y-15 = 0 // - y-15
3/4*x = -(y-15) // : 3/4
x = (-(y-15))/3/4
x = 4/3*(15-y)
x = 4/3*(15-y)
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