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x in (-oo:+oo)
18 = x+(4/5)*x // - x+(4/5)*x
18-x-((4/5)*x) = 0
(-4/5)*x-x+18 = 0
18-9/5*x = 0 // - 18
-9/5*x = -18 // : -9/5
x = -18/(-9/5)
x = 10
x = 10
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