How do you solve #15= - 11d - 18#?
So in this case, you would have to add
If you don't then, the equation would be unbalanced and you ONLY make your life harder and the equation would be impossible to solve.
After you have added
#15 + 18 = -11d - cancel(18) + cancel(18)#
#33 = -11d#
You isolated the
Do that, you would like to divide
REMEMBER, NOT TO LOSE THE NEGATIVE SIGN DURING YOUR CALCULATIONS BECAUSE THEN YOU WOULD CHANGE THE ENTIRE PROBLEM.
After that, you will get to the final answer
#33/(-11) = (cancel(-11)d)/cancel(-11)#
#d = -3 #