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4+x=-4x+9
We move all terms to the left:
4+x-(-4x+9)=0
We get rid of parentheses
x+4x-9+4=0
We add all the numbers together, and all the variables
5x-5=0
We move all terms containing x to the left, all other terms to the right
5x=5
x=5/5
x=1
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