Hi again Kevin... same process for this question. You want to work to get the x by itself to solve the equation.
Start by adding 13 to both sides and remember -103 PLUS 13 = -90... so you get -9x = -90
Next, divide both sides by -9 and you get x = 10
He's 22 correct? If you divide his age by 2 (the only even prime number) and add four, you get 15 which is the LCM of 3 and 5
Incorrect Brian.... the multiplication step clears first before adding or subtracting any numbers.