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340=2x+30
We move all terms to the left:
340-(2x+30)=0
We get rid of parentheses
-2x-30+340=0
We add all the numbers together, and all the variables
-2x+310=0
We move all terms containing x to the left, all other terms to the right
-2x=-310
x=-310/-2
x=+155
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