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x+45=2x-19
We move all terms to the left:
x+45-(2x-19)=0
We get rid of parentheses
x-2x+19+45=0
We add all the numbers together, and all the variables
-1x+64=0
We move all terms containing x to the left, all other terms to the right
-x=-64
x=-64/-1
x=+64
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