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x in (-oo:+oo)
Y-((4/3)*x) = 2.5 // - 2.5
Y-((4/3)*x)-2.5 = 0
Y+(-4/3)*x-2.5 = 0
Y-4/3*x-2.5 = 0 // - Y-2.5
-4/3*x = -(Y-2.5) // : -4/3
x = (-(Y-2.5))/(-4/3)
x = -3/4*(2.5-Y)
x = -3/4*(2.5-Y)
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