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a in (-oo:+oo)
(1/2)*(a+5) = (1/4)*(a+2) // - (1/4)*(a+2)
(1/2)*(a+5)-((1/4)*(a+2)) = 0
(1/2)*(a+5)+(-1/4)*(a+2) = 0
1/2*(a+5)-1/4*(a+2) = 0
1/2*(a+5)-1/4*(a+2) = 0
1/4*a+2 = 0
1/4*a+2 = 0
1/4*a+2 = 0 // - 2
1/4*a = -2 // : 1/4
a = -2/1/4
a = -8
a = -8
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