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x in (-oo:+oo)
y+7 = (8/5)*(x-5) // - (8/5)*(x-5)
y-((8/5)*(x-5))+7 = 0
(-8/5)*(x-5)+y+7 = 0
y-8/5*(x-5)+7 = 0
y-8/5*(x-5)+7 = 0
y-8/5*x+7+8 = 0
y-8/5*x+15 = 0
y-8/5*x+15 = 0
y-8/5*x+15 = 0 // - y+15
-8/5*x = -(y+15) // : -8/5
x = (-(y+15))/(-8/5)
x = 5/8*(y+15)
x = 5/8*(y+15)
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