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t in (-oo:+oo)
(1/3)*(2*t+7) = -3 // + 3
(1/3)*(2*t+7)+3 = 0
1/3*(2*t+7)+3 = 0
1/3*(2*t+7)+3 = 0
2/3*t+16/3 = 0
2/3*t+16/3 = 0
2/3*t+16/3 = 0 // - 16/3
2/3*t = -16/3 // : 2/3
t = -16/3/2/3
t = -8
t = -8
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