$$\frac{2t}{5}-3=2t$$
$t = -\frac{15}{8} = -1\frac{7}{8} = -1.875$
$$2t-15=10t$$
$$2t-15-10t=0$$
$$-8t-15=0$$
$$-8t=15$$
$$t=\frac{15}{-8}$$
$$t=-\frac{15}{8}$$
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