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