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a in (-oo:+oo)
(2/3)*a-7 = (1/2)*a-6 // - (1/2)*a-6
(2/3)*a-((1/2)*a)-7+6 = 0
(2/3)*a+(-1/2)*a-7+6 = 0
1/6*a-1 = 0 // + 1
1/6*a = 1 // : 1/6
a = 1/1/6
a = 6
a = 6
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