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x in (-oo:+oo)
y+12 = (4/3)*(x-5) // - (4/3)*(x-5)
y-((4/3)*(x-5))+12 = 0
(-4/3)*(x-5)+y+12 = 0
y-4/3*(x-5)+12 = 0
y-4/3*(x-5)+12 = 0
y-4/3*x+20/3+12 = 0
y-4/3*x+56/3 = 0
y-4/3*x+56/3 = 0
y-4/3*x+56/3 = 0 // - y+56/3
-4/3*x = -(y+56/3) // : -4/3
x = (-(y+56/3))/(-4/3)
x = 3/4*(y+56/3)
x = 3/4*(y+56/3)
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