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x in (-oo:+oo)
(3/7)*x = 30/7 // - 30/7
(3/7)*x-(30/7) = 0
(3/7)*x-30/7 = 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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