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x in (-oo:+oo)
(1/3)*x = 31/7 // - 31/7
(1/3)*x-(31/7) = 0
(1/3)*x-31/7 = 0
1/3*x-31/7 = 0 // + 31/7
1/3*x = 31/7 // : 1/3
x = 31/7/1/3
x = 93/7
x = 93/7
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