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7*x-((1/5)*x)+7/9 = 2081/315 // - 2081/315
7*x-((1/5)*x)+7/9-(2081/315) = 0
7*x+(-1/5)*x+7/9-2081/315 = 0
34/5*x-204/35 = 0 // + 204/35
34/5*x = 204/35 // : 34/5
x = 204/35/34/5
x = 6/7
x = 6/7
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