In the past you paid $800 per month to rent your apartment. You now pay $900 per month for your rent. What is the percent increa
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a = 2x + 6xz
a = x(2 + 6z) <em>factored out "x" on right side</em>
a/(2 + 6z) = x <em>divided both sides by (2 + 6z)</em>
Answer: x =