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(1/9)*x+47 = (8/9)*x-23 // - (8/9)*x-23
(1/9)*x-((8/9)*x)+23+47 = 0
(1/9)*x+(-8/9)*x+23+47 = 0
70-7/9*x = 0 // - 70
-7/9*x = -70 // : -7/9
x = -70/(-7/9)
x = 90
x = 90
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