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x in (-oo:+oo)
(1*x)/2 = 7 // - 7
(1*x)/2-7 = 0
x/2-7 = 0
1/2*x-7 = 0 // + 7
1/2*x = 7 // : 1/2
x = 7/1/2
x = 14
x = 14
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