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(3*x)/7-((3*x)/8) = 1 // - 1
(3*x)/7-((3*x)/8)-1 = 0
(3*x)/7+(-3/8)*x-1 = 0
3/56*x-1 = 0 // + 1
3/56*x = 1 // : 3/56
x = 1/3/56
x = 56/3
x = 56/3
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