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3x+100=16x+9
We move all terms to the left:
3x+100-(16x+9)=0
We get rid of parentheses
3x-16x-9+100=0
We add all the numbers together, and all the variables
-13x+91=0
We move all terms containing x to the left, all other terms to the right
-13x=-91
x=-91/-13
x=+7
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