## Elementary Technical Mathematics

$w=10\frac{1}{2}$
$w-7\frac{1}{2}=3$ $w-7\frac{1}{2}+7\frac{1}{2}=3+7\frac{1}{2}\longrightarrow$ add $7\frac{1}{2}$ to both sides $w=10\frac{1}{2}$ To check, substitute the value for w and see of the result is true. $10\frac{1}{2}-7\frac{1}{2}=3$ $3=3\checkmark$