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-45+6x=-669+58x
We move all terms to the left:
-45+6x-(-669+58x)=0
We add all the numbers together, and all the variables
6x-(58x-669)-45=0
We get rid of parentheses
6x-58x+669-45=0
We add all the numbers together, and all the variables
-52x+624=0
We move all terms containing x to the left, all other terms to the right
-52x=-624
x=-624/-52
x=+12
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