Let's simplify the equation step by step:
90 - 3a - (a + 8) = 7
First, distribute the negative sign through the parentheses:
90 - 3a - a - 8 = 7
Combine like terms:
90 - 4a - 8 = 7
Now, combine the constants:
82 - 4a = 7
Next, subtract 82 from both sides of the equation:
-4a = -75
Finally, divide by -4 to solve for 'a':
a = 18.75
So, the solution to the equation is a = 18.75.
Let's simplify the equation step by step:
90 - 3a - (a + 8) = 7
First, distribute the negative sign through the parentheses:
90 - 3a - a - 8 = 7
Combine like terms:
90 - 4a - 8 = 7
Now, combine the constants:
82 - 4a = 7
Next, subtract 82 from both sides of the equation:
-4a = -75
Finally, divide by -4 to solve for 'a':
a = 18.75
So, the solution to the equation is a = 18.75.