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a in (-oo:+oo)
(1/6)*(a-3) = 10 // - 10
(1/6)*(a-3)-10 = 0
1/6*(a-3)-10 = 0
1/6*(a-3)-10 = 0
1/6*a-21/2 = 0
1/6*a-21/2 = 0
1/6*a-21/2 = 0 // + 21/2
1/6*a = 21/2 // : 1/6
a = 21/2/1/6
a = 63
a = 63
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