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(7/3)*x+63/84 = 20 // - 20
(7/3)*x+63/84-20 = 0
7/3*x-77/4 = 0 // + 77/4
7/3*x = 77/4 // : 7/3
x = 77/4/7/3
x = 33/4
x = 33/4
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