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45-5x=5x+50
We move all terms to the left:
45-5x-(5x+50)=0
We get rid of parentheses
-5x-5x-50+45=0
We add all the numbers together, and all the variables
-10x-5=0
We move all terms containing x to the left, all other terms to the right
-10x=5
x=5/-10
x=-1/2
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