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t in (-oo:+oo)
3*t+3/4 = -81/4 // + -81/4
3*t+3/4-(-81/4) = 0
3*t+3/4+81/4 = 0
3*t+21 = 0 // - 21
3*t = -21 // : 3
t = -21/3
t = -7
t = -7
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