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(4/7)*x-1 = 55/7 // - 55/7
(4/7)*x-(55/7)-1 = 0
(4/7)*x-55/7-1 = 0
4/7*x-62/7 = 0 // + 62/7
4/7*x = 62/7 // : 4/7
x = 62/7/4/7
x = 31/2
x = 31/2
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