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(7/5)*x-((2/3)*x)-15+9 = 0
(7/5)*x+(-2/3)*x-15+9 = 0
11/15*x-6 = 0 // + 6
11/15*x = 6 // : 11/15
x = 6/11/15
x = 90/11
x = 90/11
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