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(3/4)*x+x-(3/7) = 173/168 // - 173/168
(3/4)*x+x-(3/7)-(173/168) = 0
(3/4)*x+x-3/7-173/168 = 0
7/4*x-35/24 = 0 // + 35/24
7/4*x = 35/24 // : 7/4
x = 35/24/7/4
x = 5/6
x = 5/6
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