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(4/7)*x+5/9 = 211/315 // - 211/315

(4/7)*x+5/9-(211/315) = 0

(4/7)*x+5/9-211/315 = 0

4/7*x-4/35 = 0 // + 4/35

4/7*x = 4/35 // : 4/7

x = 4/35/4/7

x = 1/5

x = 1/5

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