Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$2x+7=21$$

Answer

x=7

Solution


Subtract \(7\) from both sides.
\[2x=21-7\]
Simplify  \(21-7\)  to  \(14\).
\[2x=14\]
Divide both sides by \(2\).
\[x=\frac{14}{2}\]
Simplify  \(\frac{14}{2}\)  to  \(7\).
\[x=7\]
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