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x in (-oo:+oo)
5*x+1/2 = 7*x-(15/2) // - 7*x-(15/2)
5*x-(7*x)+1/2+15/2 = 0
5*x-7*x+1/2+15/2 = 0
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
x = 4
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