[tex]4(a+3)=36[/tex]
Delete the parentheses, multiplying with the number of outside, making the set of signals
[tex]4a + 12 = 36[/tex]
Number with incognito are to the left of the equality and numbers without incognito are to the right, remembering that when changing of side changes the signal.
[tex]4a = 36 - 12[/tex]
[tex]4a = 24[/tex]
[tex]a = \frac{24}{4} [/tex]
[tex]\boxed{a = 6}[/tex]
Confirm that the solution is correct:
[tex]4(a+3)=36[/tex]
[tex]4(6+3)=36[/tex]
[tex]4(9)=36[/tex]
[tex]36=36[/tex] (TRUE)
Answer:
[tex]\boxed{a = 6}[/tex]
