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(7*x)/6-3 = (4*x)/9+12 // - (4*x)/9+12
(7*x)/6-((4*x)/9)-12-3 = 0
(7*x)/6+(-4/9)*x-12-3 = 0
13/18*x-15 = 0 // + 15
13/18*x = 15 // : 13/18
x = 15/13/18
x = 270/13
x = 270/13
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