[tex]\boxed{a=\frac{r+d}{c}}[/tex]
Here we have the following expression:
[tex]ac=r+d[/tex]
And the question asks for solving the equation for the variable [tex]a[/tex]. So we need to divide both sides of the equation by [tex]c[/tex]:
[tex]ac=r+d \\ \\ \frac{ac}{c}=\frac{r+d}{c} \\ \\ \\ But: \\ \\ \frac{c}{c}=1 \\ \\ \\ So: \\ \\ \boxed{a=\frac{r+d}{c}}[/tex]
Solving equations: https://brainly.com/question/10643312
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