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x in (-oo:+oo)
x/5 = x/2-9 // - x/2-9
x/5-(x/2)+9 = 0
9-3/10*x = 0 // - 9
-3/10*x = -9 // : -3/10
x = -9/(-3/10)
x = 30
x = 30
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