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x in (-oo:+oo)
Y+3 = (5/2)*(x+3) // - (5/2)*(x+3)
Y-((5/2)*(x+3))+3 = 0
(-5/2)*(x+3)+Y+3 = 0
Y-5/2*(x+3)+3 = 0
Y-5/2*(x+3)+3 = 0
Y-5/2*x-15/2+3 = 0
Y-5/2*x-9/2 = 0
Y-5/2*x-9/2 = 0
Y-5/2*x-9/2 = 0 // - Y-9/2
-5/2*x = -(Y-9/2) // : -5/2
x = (-(Y-9/2))/(-5/2)
x = -2/5*(9/2-Y)
x = -2/5*(9/2-Y)
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