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x in (-oo:+oo)
(1/2)*x+7 = 5/2 // - 5/2
(1/2)*x-(5/2)+7 = 0
(1/2)*x-5/2+7 = 0
1/2*x+9/2 = 0 // - 9/2
1/2*x = -9/2 // : 1/2
x = -9/2/1/2
x = -9
x = -9
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