$$8t+5=2t-31; (8-7)$$
$u=1$
$$8t+5-2t=-31$$
$$6t+5=-31$$
$$6t=-31-5$$
$$6t=-36$$
$$t=\frac{-36}{6}$$
$$t=-6$$
$$u=1$$
$$t=-6$$ $$u=1$$
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