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x in (-oo:+oo)
y+8 = (6/5)*(x+7) // - (6/5)*(x+7)
y-((6/5)*(x+7))+8 = 0
(-6/5)*(x+7)+y+8 = 0
y-6/5*(x+7)+8 = 0
y-6/5*(x+7)+8 = 0
y-6/5*x-42/5+8 = 0
y-6/5*x-2/5 = 0
y-6/5*x-2/5 = 0
y-6/5*x-2/5 = 0 // - y-2/5
-6/5*x = -(y-2/5) // : -6/5
x = (-(y-2/5))/(-6/5)
x = -5/6*(2/5-y)
x = -5/6*(2/5-y)
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