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-69=5x-279
We move all terms to the left:
-69-(5x-279)=0
We get rid of parentheses
-5x+279-69=0
We add all the numbers together, and all the variables
-5x+210=0
We move all terms containing x to the left, all other terms to the right
-5x=-210
x=-210/-5
x=+42
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