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