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x in (-oo:+oo)
9 = x+(50/100)*x // - x+(50/100)*x
9-x-((50/100)*x) = 0
(-1/2)*x-x+9 = 0
9-3/2*x = 0 // - 9
-3/2*x = -9 // : -3/2
x = -9/(-3/2)
x = 6
x = 6
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