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340=100+6x
We move all terms to the left:
340-(100+6x)=0
We add all the numbers together, and all the variables
-(6x+100)+340=0
We get rid of parentheses
-6x-100+340=0
We add all the numbers together, and all the variables
-6x+240=0
We move all terms containing x to the left, all other terms to the right
-6x=-240
x=-240/-6
x=+40
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