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x in (-oo:+oo)
y = (5/4)*x-(7/4) // - (5/4)*x-(7/4)
y-((5/4)*x)+7/4 = 0
(-5/4)*x+y+7/4 = 0
y-5/4*x+7/4 = 0 // - y+7/4
-5/4*x = -(y+7/4) // : -5/4
x = (-(y+7/4))/(-5/4)
x = 4/5*(y+7/4)
x = 4/5*(y+7/4)
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