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x in (-oo:+oo)
2*x+5 = (5*x)/2 // - (5*x)/2
2*x-((5*x)/2)+5 = 0
2*x+(-5/2)*x+5 = 0
5-1/2*x = 0 // - 5
-1/2*x = -5 // : -1/2
x = -5/(-1/2)
x = 10
x = 10
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