Answer
$d_1=tV + d_2$
Work Step by Step
Multiply $t$ to both sides to find:
$t \cdot V = t \cdot \dfrac{d_1-d_2}{t}
\\tV = d_1-d_2$
Add $d_2$ to both sides to find:
$tV + d_2 = d_1-d_2+d_2
\\tV + d_2 = d_1
\\d_1=tV + d_2$
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