M.9 Solve two-step equations: complete the solution GK7
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Complete the process of solving the equation.
Fill in the missing term on each line. Simplify any fractions.
\[
\begin{aligned}
12 r+3 & =15 \\
12 r & =\square \quad \text { Subtract } 3 \text { from both sides } \\
r & =\square \text { Divide both sides by } 12
\end{aligned}
\]
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Answer

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Answer

So, the solution is $\boxed{1}$.

Steps

Step 1 ：Subtract 3 from each side of the equation to get $12r = 15 - 3$.

Step 2 ：Simplify the right side of the equation to get $12r = 12$.

Step 3 ：Divide each side of the equation by 12 to solve for r, $r = \frac{12}{12}$.

Step 4 ：Simplify the right side of the equation to get $r = 1$.

Step 5 ：So, the solution is $\boxed{1}$.