How do you solve #6r+7=13+7r#?
In order to do this, let's subtract 7 from each side:
Next, let's subtract
Finally, let's divide each side by -1 to get our answer:
Collect the constants on one side of the = and the variables (terms with r ) on the other side. Then manipulate so that you only have a single r on its own on one side and everything else on the other.
The short cut approach for add or subtract is: Move something to the other side of the = and change its sign.