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69=4x+31
We move all terms to the left:
69-(4x+31)=0
We get rid of parentheses
-4x-31+69=0
We add all the numbers together, and all the variables
-4x+38=0
We move all terms containing x to the left, all other terms to the right
-4x=-38
x=-38/-4
x=9+1/2
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