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3x+19=5x+81
We move all terms to the left:
3x+19-(5x+81)=0
We get rid of parentheses
3x-5x-81+19=0
We add all the numbers together, and all the variables
-2x-62=0
We move all terms containing x to the left, all other terms to the right
-2x=62
x=62/-2
x=-31
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