This is from the back page of our algebra 3 booklet on page 40. In this document you will see the solutions for question 2: c - j. I show you how to solve for the variable by undoing each operation in the equation. You will see the step by step process for solving for the variable in this way.
Notice that once I find the value of the variable (what x equals), I take this value and substitute it back into the original equation. If the math works, the value we found for the variable must be correct.
P. 40 question 2: c - j
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