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x in (-oo:+oo)
1/2 = 7*x // - 7*x
1/2-(7*x) = 0
1/2-7*x = 0
1/2-7*x = 0 // - 1/2
-7*x = -1/2 // : -7
x = -1/2/(-7)
x = 1/14
x = 1/14
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