Question

1) 2-7=1+2z




2) 5+4a=a-3​

Answer 1

Explicação passo-a-passo:

1=

$2 - 7 = 1 + 2z$

$- 5 = 1 + 2z$

$- 2z = 1 + 5$

$- 2z = 6$

$z = - 3$

2=

$5 + 4a = a - 3$

$4a - a = - 3 - 5$

$3a = - 8$

$a = - \frac{8}{3}$