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(3/7)*x+3 = 51/7 // - 51/7
(3/7)*x-(51/7)+3 = 0
(3/7)*x-51/7+3 = 0
3/7*x-30/7 = 0 // + 30/7
3/7*x = 30/7 // : 3/7
x = 30/7/3/7
x = 10
x = 10
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