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t in (-oo:+oo)
(1/4)*(t+20) = 30 // - 30
(1/4)*(t+20)-30 = 0
1/4*(t+20)-30 = 0
1/4*(t+20)-30 = 0
1/4*t-25 = 0
1/4*t-25 = 0
1/4*t-25 = 0 // + 25
1/4*t = 25 // : 1/4
t = 25/1/4
t = 100
t = 100
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