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x in (-oo:+oo)
-x-(5/(-2))-7 = 2*x+8 // - 2*x+8
-x-(2*x)-(5/(-2))-8-7 = 0
5/2-x-2*x-8-7 = 0
-3*x-25/2 = 0 // + 25/2
-3*x = 25/2 // : -3
x = 25/2/(-3)
x = -25/6
x = -25/6
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