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x in (-oo:+oo)
15-(x/5) = x/10 // - x/10
15-(x/5)-(x/10) = 0
15-3/10*x = 0 // - 15
-3/10*x = -15 // : -3/10
x = -15/(-3/10)
x = 50
x = 50
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