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x in (-oo:+oo)
-x = (5/2)*x-3 // - (5/2)*x-3
3-x-((5/2)*x) = 0
(-5/2)*x-x+3 = 0
3-7/2*x = 0 // - 3
-7/2*x = -3 // : -7/2
x = -3/(-7/2)
x = 6/7
x = 6/7
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