Respuesta :
b=6, x=5
Explanation
[tex]-12=b-18[/tex]Step 1
action: add 18 in both sides
property: Additive property: When a number is added or subtracted from both sides of the equality, the equality holds
then,add 18 in both sides
[tex]\begin{gathered} -12=b-18 \\ -12+18=b-18+18 \\ 6=b \\ b=6 \end{gathered}[/tex]Step 2
[tex]9x=45[/tex]Action:divide both sides by 9
The property for division : The property for division tells us that if we divide both sides of the equality by a real number (other than zero), we obtain another new valid equality.
[tex]\begin{gathered} 9x=45 \\ \frac{9x}{9}=\frac{45}{9} \\ x=5 \end{gathered}[/tex]