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(4/7)*x = 16/7 // - 16/7
(4/7)*x-(16/7) = 0
(4/7)*x-16/7 = 0
4/7*x-16/7 = 0 // + 16/7
4/7*x = 16/7 // : 4/7
x = 16/7/4/7
x = 4
x = 4
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