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t in (-oo:+oo)
7*(4*t+10) = 238 // - 238
7*(4*t+10)-238 = 0
7*(4*t+10)-238 = 0
28*t-168 = 0
28*t-168 = 0
28*t-168 = 0 // + 168
28*t = 168 // : 28
t = 168/28
t = 6
t = 6
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