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a in (-oo:+oo)
(2/3)*(a-18) = -6 // + 6
(2/3)*(a-18)+6 = 0
2/3*(a-18)+6 = 0
2/3*(a-18)+6 = 0
2/3*a-6 = 0
2/3*a-6 = 0
2/3*a-6 = 0 // + 6
2/3*a = 6 // : 2/3
a = 6/2/3
a = 9
a = 9
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