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x in (-oo:+oo)
10 = (5/4)*x // - (5/4)*x
10-((5/4)*x) = 0
(-5/4)*x+10 = 0
10-5/4*x = 0 // - 10
-5/4*x = -10 // : -5/4
x = -10/(-5/4)
x = 8
x = 8
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