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(4*x)/9 = (7*x)/8-31 // - (7*x)/8-31
(4*x)/9-((7*x)/8)+31 = 0
(4*x)/9+(-7/8)*x+31 = 0
31-31/72*x = 0 // - 31
-31/72*x = -31 // : -31/72
x = -31/(-31/72)
x = 72
x = 72
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