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3*(7*x-1)+4*x = 4/7 // - 4/7
3*(7*x-1)+4*x-(4/7) = 0
3*(7*x-1)+4*x-4/7 = 0
(3*7*(7*x-1))/7+(4*7*x)/7-4/7 = 0
3*7*(7*x-1)+4*7*x-4 = 0
175*x-21-4 = 0
175*x-25 = 0
(175*x-25)/7 = 0
(175*x-25)/7 = 0 // * 7
175*x-25 = 0
175*x-25 = 0 // + 25
175*x = 25 // : 175
x = 25/175
x = 1/7
x = 1/7
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