$$-9t-10=5t+25$$
$t = -\frac{5}{2} = -2\frac{1}{2} = -2.5$
$$-9t-10-5t=25$$
$$-14t-10=25$$
$$-14t=25+10$$
$$-14t=35$$
$$t=\frac{35}{-14}$$
$$t=-\frac{5}{2}$$
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