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(9/5)*x+6 = 15-((6/5)*x) // - 15-((6/5)*x)
(9/5)*x+(6/5)*x-15+6 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x = 3
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