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x in (-oo:+oo)
y-5 = (9/5)*(x+12) // - (9/5)*(x+12)
y-((9/5)*(x+12))-5 = 0
(-9/5)*(x+12)+y-5 = 0
y-9/5*(x+12)-5 = 0
y-9/5*(x+12)-5 = 0
y-9/5*x-108/5-5 = 0
y-9/5*x-133/5 = 0
y-9/5*x-133/5 = 0
y-9/5*x-133/5 = 0 // - y-133/5
-9/5*x = -(y-133/5) // : -9/5
x = (-(y-133/5))/(-9/5)
x = -5/9*(133/5-y)
x = -5/9*(133/5-y)
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