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x in (-oo:+oo)
y = (2/3)*x+1/4 // - (2/3)*x+1/4
y-((2/3)*x)-(1/4) = 0
(-2/3)*x+y-1/4 = 0
y-2/3*x-1/4 = 0 // - y-1/4
-2/3*x = -(y-1/4) // : -2/3
x = (-(y-1/4))/(-2/3)
x = -3/2*(1/4-y)
x = -3/2*(1/4-y)
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