How do you solve #12z + 4z - 7z = 9#?

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Answer 1 · 2017-09-25T15:10:26

See a solution process below:

First, combine like terms on the left side of the equation:

#(12 + 4 - 7)z = 9#

#9z = 9#

Now, divide each side of the equation by #color(red)(9)# to solve for #z# while keeping the equation balanced:

#(9z)/color(red)(9) = 9/color(red)(9)#

#(color(red)(cancel(color(black)(9)))z)/cancel(color(red)(9)) = 1#

#z = 1#