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x in (-oo:+oo)
y-5 = (-1/3)*(x-15) // - (-1/3)*(x-15)
y-((-1/3)*(x-15))-5 = 0
(1/3)*(x-15)+y-5 = 0
1/3*(x-15)+y-5 = 0
1/3*(x-15)+y-5 = 0
1/3*x+y-5-5 = 0
1/3*x+y-10 = 0
1/3*x+y-10 = 0
1/3*x+y-10 = 0 // - y-10
1/3*x = -(y-10) // : 1/3
x = (-(y-10))/1/3
x = 3*(10-y)
x = 3*(10-y)
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