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3x+4-x=4x+100
We move all terms to the left:
3x+4-x-(4x+100)=0
We add all the numbers together, and all the variables
2x-(4x+100)+4=0
We get rid of parentheses
2x-4x-100+4=0
We add all the numbers together, and all the variables
-2x-96=0
We move all terms containing x to the left, all other terms to the right
-2x=96
x=96/-2
x=-48
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