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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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