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t in (-oo:+oo)
7*t-4 = -7*t-32 // + -7*t-32
7*t-(-7*t)-4+32 = 0
7*t+7*t-4+32 = 0
14*t+28 = 0 // - 28
14*t = -28 // : 14
t = -28/14
t = -2
t = -2
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