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x in (-oo:+oo)
-5/4 = (7/5)*x // - (7/5)*x
-((7/5)*x)-5/4 = 0
(-7/5)*x-5/4 = 0
-7/5*x-5/4 = 0 // + 5/4
-7/5*x = 5/4 // : -7/5
x = 5/4/(-7/5)
x = -25/28
x = -25/28
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