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x+45=2x-1
We move all terms to the left:
x+45-(2x-1)=0
We get rid of parentheses
x-2x+1+45=0
We add all the numbers together, and all the variables
-1x+46=0
We move all terms containing x to the left, all other terms to the right
-x=-46
x=-46/-1
x=+46
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