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