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x in (-oo:+oo)
9-((1/10)*x) = (1/5)*x // - (1/5)*x
9-((1/10)*x)-((1/5)*x) = 0
(-1/10)*x+(-1/5)*x+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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