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x in (-oo:+oo)
9 = (4/9)*x // - (4/9)*x
9-((4/9)*x) = 0
(-4/9)*x+9 = 0
9-4/9*x = 0 // - 9
-4/9*x = -9 // : -4/9
x = -9/(-4/9)
x = 81/4
x = 81/4
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