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x in (-oo:+oo)
3/2-(7*x) = 7 // - 7
3/2-(7*x)-7 = 0
3/2-7*x-7 = 0
-7*x-11/2 = 0 // + 11/2
-7*x = 11/2 // : -7
x = 11/2/(-7)
x = -11/14
x = -11/14
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