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x in (-oo:+oo)
(1/9)*x = 4.5 // - 4.5
(1/9)*x-4.5 = 0
1/9*x-4.5 = 0 // + 4.5
1/9*x = 4.5 // : 1/9
x = 4.5/1/9
x = 40.50000041
x = 40.50000041
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