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6x=45+7x
We move all terms to the left:
6x-(45+7x)=0
We add all the numbers together, and all the variables
6x-(7x+45)=0
We get rid of parentheses
6x-7x-45=0
We add all the numbers together, and all the variables
-1x-45=0
We move all terms containing x to the left, all other terms to the right
-x=45
x=45/-1
x=-45
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