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(1/7)*(2*x-1) = 7 // - 7
(1/7)*(2*x-1)-7 = 0
1/7*(2*x-1)-7 = 0
1/7*(2*x-1)-7 = 0
2/7*x-50/7 = 0
2/7*x-50/7 = 0
2/7*x-50/7 = 0 // + 50/7
2/7*x = 50/7 // : 2/7
x = 50/7/2/7
x = 25
x = 25
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