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x in (-oo:+oo)
y = (4/5)*(x+12)-11 // - (4/5)*(x+12)-11
y-((4/5)*(x+12))+11 = 0
(-4/5)*(x+12)+y+11 = 0
y-4/5*(x+12)+11 = 0
y-4/5*(x+12)+11 = 0
y-4/5*x-48/5+11 = 0
y-4/5*x+7/5 = 0
y-4/5*x+7/5 = 0
y-4/5*x+7/5 = 0 // - y+7/5
-4/5*x = -(y+7/5) // : -4/5
x = (-(y+7/5))/(-4/5)
x = 5/4*(y+7/5)
x = 5/4*(y+7/5)
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