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t in (-oo:+oo)
(1/3)*(t-18) = 15 // - 15
(1/3)*(t-18)-15 = 0
1/3*(t-18)-15 = 0
1/3*(t-18)-15 = 0
1/3*t-21 = 0
1/3*t-21 = 0
1/3*t-21 = 0 // + 21
1/3*t = 21 // : 1/3
t = 21/1/3
t = 63
t = 63
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