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x in (-oo:+oo)
-7 = (1/2)*x-2 // - (1/2)*x-2
2-((1/2)*x)-7 = 0
(-1/2)*x-7+2 = 0
-1/2*x-5 = 0 // + 5
-1/2*x = 5 // : -1/2
x = 5/(-1/2)
x = -10
x = -10
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