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a in (-oo:+oo)
(2*(a+2))/4+0.5*a = 0
(2*(a+2))/4+(0.5*4*a)/4 = 0
2*(a+2)+0.5*4*a = 0
4*a+4 = 0
(4*a+4)/4 = 0
(4*a+4)/4 = 0 // * 4
4*a+4 = 0
4*a+4 = 0 // - 4
4*a = -4 // : 4
a = -4/4
a = -1
a = -1
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