Question #8fd98

1 Answer

Answer:

Like terms have the same variable, and the same power.

Explanation:

#-4#, #-5#, and #90# are all like terms because they don't have a variable. These are called 'constants'.

So, add the #-4# and #-5# to the #90# to get #99#. Note these are added as positive values since they're negative on the left-hand side of the equation.

Then you have

#9x = 99#

Divide both sides by #9# to get

#x = 11#

You divide since it's the inverse operation for multiplication.

Check your work by plugging #11# back into your equation for variable #x#.

#-4 - 9 + 9*11 = 90#