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(4/7)*x+7/10 = 449/70 // - 449/70
(4/7)*x+7/10-(449/70) = 0
(4/7)*x+7/10-449/70 = 0
4/7*x-40/7 = 0 // + 40/7
4/7*x = 40/7 // : 4/7
x = 40/7/4/7
x = 10
x = 10
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