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(3/7)*x-x+10 = 66/7 // - 66/7
(3/7)*x-x-(66/7)+10 = 0
(3/7)*x-x-66/7+10 = 0
4/7-4/7*x = 0 // - 4/7
-4/7*x = -4/7 // : -4/7
x = -4/7/(-4/7)
x = 1
x = 1
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