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x-((3/5)*x)+7/9 = 191/315 // - 191/315
x-((3/5)*x)+7/9-(191/315) = 0
x+(-3/5)*x+7/9-191/315 = 0
2/5*x+6/35 = 0 // - 6/35
2/5*x = -6/35 // : 2/5
x = -6/35/2/5
x = -3/7
x = -3/7
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