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(3/7)*x+6 = 45/7 // - 45/7
(3/7)*x-(45/7)+6 = 0
(3/7)*x-45/7+6 = 0
3/7*x-3/7 = 0 // + 3/7
3/7*x = 3/7 // : 3/7
x = 3/7/3/7
x = 1
x = 1
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