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