Question

1)Aflati a din:
(12+a)+14=4xa-4=?

Answer 1

$\displaystyle (12+a)+14=4a-4 \\ 12+a+14=4a-4 \\ a-4a=-4-12-14 \\ -3a=-30 \\ a= \frac{-30}{-3} \\ a=10$