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6/5 = (10/9)*x+4 // - (10/9)*x+4
6/5-((10/9)*x)-4 = 0
(-10/9)*x+6/5-4 = 0
-10/9*x-14/5 = 0 // + 14/5
-10/9*x = 14/5 // : -10/9
x = 14/5/(-10/9)
x = -63/25
x = -63/25
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