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x in (-oo:+oo)
Y-2 = (2/5)*(x-5) // - (2/5)*(x-5)
Y-((2/5)*(x-5))-2 = 0
(-2/5)*(x-5)+Y-2 = 0
Y-2/5*(x-5)-2 = 0
Y-2/5*(x-5)-2 = 0
Y-2/5*x-2+2 = 0
Y-2/5*x = 0
Y-2/5*x = 0
Y-2/5*x = 0 // - Y
-2/5*x = -Y // : -2/5
x = -Y/(-2/5)
x = 5/2*Y
x = 5/2*Y
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