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a in (-oo:+oo)
(2/3)*(a-3) = 15 // - 15
(2/3)*(a-3)-15 = 0
2/3*(a-3)-15 = 0
2/3*(a-3)-15 = 0
2/3*a-17 = 0
2/3*a-17 = 0
2/3*a-17 = 0 // + 17
2/3*a = 17 // : 2/3
a = 17/2/3
a = 51/2
a = 51/2
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