Question

4. Dêo valor de a na equação 3a +8(1 - a) = 10. ​

Answer 1

$3a+8(1-a)=10$

$3a+8-8a=10$

$-5a+8=10$

$-5a=10-8$

$-5a=2$

$a=\dfrac{2}{-5}$

$a=-\dfrac{2}{5}=\boxed{-0{,}4}$