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x in (-oo:+oo)
45 = (8*x)/9 // - (8*x)/9
45-((8*x)/9) = 0
(-8/9)*x+45 = 0
45-8/9*x = 0 // - 45
-8/9*x = -45 // : -8/9
x = -45/(-8/9)
x = 405/8
x = 405/8
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