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x in (-oo:+oo)
(-1/2)*x-7 = -11 // + 11
(-1/2)*x-7+11 = 0
4-1/2*x = 0 // - 4
-1/2*x = -4 // : -1/2
x = -4/(-1/2)
x = 8
x = 8
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