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t in (-oo:+oo)
(1/2)*(t+7) = 12 // - 12
(1/2)*(t+7)-12 = 0
1/2*(t+7)-12 = 0
1/2*(t+7)-12 = 0
1/2*t-17/2 = 0
1/2*t-17/2 = 0
1/2*t-17/2 = 0 // + 17/2
1/2*t = 17/2 // : 1/2
t = 17/2/1/2
t = 17
t = 17
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