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343=145+9x
We move all terms to the left:
343-(145+9x)=0
We add all the numbers together, and all the variables
-(9x+145)+343=0
We get rid of parentheses
-9x-145+343=0
We add all the numbers together, and all the variables
-9x+198=0
We move all terms containing x to the left, all other terms to the right
-9x=-198
x=-198/-9
x=+22
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