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4x-9=-30+x
We move all terms to the left:
4x-9-(-30+x)=0
We add all the numbers together, and all the variables
4x-(x-30)-9=0
We get rid of parentheses
4x-x+30-9=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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