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x in (-oo:+oo)
x+7 = (1/2)*(2*x+14) // - (1/2)*(2*x+14)
x-((1/2)*(2*x+14))+7 = 0
(-1/2)*(2*x+14)+x+7 = 0
x-1/2*(2*x+14)+7 = 0
x-1/2*(2*x+14)+7 = 0
7-7 = 0
0 = 0
0 = 0
x belongs to the empty set
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