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