Question 95365
twice the sum of 15 and a number
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Step 1.

twice the sum of 15 and <font color = "red">a number</font>

REPLACE "<font color = "red">a number</font>" by <font color = "red">N</font>

twice the sum of 15 and <font color = "red">N</font>
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Step 2.

twice <font color = "red">the sum of 15 and N</font>

Replace "<font color = "red">the sum of 15 and N</font>" by <font color = "red">(15 + N)</font>

twice <font color = "red">(15 + N)</font>

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Step 3.

<font color = "red">twice</font> (15 + N)

Replace "<font color = "red">twice</font>" by <font color = "red">2</font>

<font color = "red">2</font>(15 + N)

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2(15 + N)  is the answer.

Edwin</pre>