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x in (-oo:+oo)
(x+3)/2+4/2 = 0
(x+3)/2+2 = 0
(x+3)/2+(2^2)/2 = 0
x+3+4 = 0
x+7 = 0
(x+7)/2 = 0
(x+7)/2 = 0 // * 2
x+7 = 0
x+7 = 0 // - 7
x = -7
x = -7
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