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4/9-((7*x)/12) = 4/15-((5*x)/18) // - 4/15-((5*x)/18)
(5*x)/18-((7*x)/12)+4/9-(4/15) = 0
(-7/12)*x+(5*x)/18+4/9-4/15 = 0
8/45-11/36*x = 0 // - 8/45
-11/36*x = -8/45 // : -11/36
x = -8/45/(-11/36)
x = 32/55
x = 32/55
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