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4x=9x+100
We move all terms to the left:
4x-(9x+100)=0
We get rid of parentheses
4x-9x-100=0
We add all the numbers together, and all the variables
-5x-100=0
We move all terms containing x to the left, all other terms to the right
-5x=100
x=100/-5
x=-20
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