How do you solve #9x - 21= 3x - 27#?

1 Answer
Alan P.
Sep 20, 2016

#x=-1#

Explanation:

Given
#color(white)("XXX")9x-21=3x-27#

Add #21# to both sides
#color(white)("XXX")9x=3x-6#

Subtract #3x# from both sides
#color(white)("XXX")6x=-6#

Divide both sides by #6#
#color(white)("XXX")x=-1#

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