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x in (-oo:+oo)
-5*x-(10/2) = 10 // - 10
-5*x-(10/2)-10 = 0
-5*x-10-5 = 0
-5*x-15 = 0 // + 15
-5*x = 15 // : -5
x = 15/(-5)
x = -3
x = -3
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