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x in (-oo:+oo)
y-3 = (-3/5)*(x-10) // - (-3/5)*(x-10)
y-((-3/5)*(x-10))-3 = 0
(3/5)*(x-10)+y-3 = 0
3/5*(x-10)+y-3 = 0
3/5*(x-10)+y-3 = 0
3/5*x+y-6-3 = 0
3/5*x+y-9 = 0
3/5*x+y-9 = 0
3/5*x+y-9 = 0 // - y-9
3/5*x = -(y-9) // : 3/5
x = (-(y-9))/3/5
x = 5/3*(9-y)
x = 5/3*(9-y)
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