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(4/3)*(6*x+6/28)-x+3/7 = 0
4/3*(6*x+3/14)-x+3/7 = 0
(4/3*7*(6*x+3/14))/7+(7*(-x))/7+3/7 = 0
4/3*7*(6*x+3/14)+7*(-x)+3 = 0
49*x+2+3 = 0
49*x+5 = 0
(49*x+5)/7 = 0
(49*x+5)/7 = 0 // * 7
49*x+5 = 0
49*x+5 = 0 // - 5
49*x = -5 // : 49
x = -5/49
x = -5/49
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