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x in (-oo:+oo)
7-((7/2)*x) = -5 // + 5
5-((7/2)*x)+7 = 0
(-7/2)*x+5+7 = 0
12-7/2*x = 0 // - 12
-7/2*x = -12 // : -7/2
x = -12/(-7/2)
x = 24/7
x = 24/7
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