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(3/4)*((2/3)*x+5/7) = 8/7 // - 8/7
(3/4)*((2/3)*x+5/7)-(8/7) = 0
(3/4)*((2/3)*x+5/7)-8/7 = 0
3/4*(2/3*x+5/7)-8/7 = 0
(3/4*7*(2/3*x+5/7))/7-8/7 = 0
3/4*7*(2/3*x+5/7)-8 = 0
7/2*x-17/4 = 0
(7/2*x-17/4)/7 = 0
(7/2*x-17/4)/7 = 0 // * 7
7/2*x-17/4 = 0
7/2*x-17/4 = 0 // + 17/4
7/2*x = 17/4 // : 7/2
x = 17/4/7/2
x = 17/14
x = 17/14
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