15 - \\frac{a}{12} = 22

Explanation:

Step1: Isolate the fraction term

Subtract 15 from both sides. $-\frac{a}{12}=22 - 15$

Step2: Simplify the right - hand side

Calculate 22 - 15. $-\frac{a}{12}=7$

Step3: Solve for a

Multiply both sides by - 12. $a=7\times(-12)$

Answer:

$a = - 84$