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a in (-oo:+oo)
(1/2)*a-((1/3)*a)+9 = 26/3 // - 26/3
(1/2)*a-((1/3)*a)-(26/3)+9 = 0
(1/2)*a+(-1/3)*a-26/3+9 = 0
1/6*a+1/3 = 0 // - 1/3
1/6*a = -1/3 // : 1/6
a = -1/3/1/6
a = -2
a = -2
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