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4x+9=14x-91
We move all terms to the left:
4x+9-(14x-91)=0
We get rid of parentheses
4x-14x+91+9=0
We add all the numbers together, and all the variables
-10x+100=0
We move all terms containing x to the left, all other terms to the right
-10x=-100
x=-100/-10
x=+10
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