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a in (-oo:+oo)
(1/2)*(3*a-1) = a-5 // - a-5
(1/2)*(3*a-1)-a+5 = 0
1/2*(3*a-1)-a+5 = 0
1/2*(3*a-1)-a+5 = 0
1/2*a-1/2+5 = 0
1/2*a+9/2 = 0
1/2*a+9/2 = 0
1/2*a+9/2 = 0 // - 9/2
1/2*a = -9/2 // : 1/2
a = -9/2/1/2
a = -9
a = -9
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