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x=30+4x
We move all terms to the left:
x-(30+4x)=0
We add all the numbers together, and all the variables
x-(4x+30)=0
We get rid of parentheses
x-4x-30=0
We add all the numbers together, and all the variables
-3x-30=0
We move all terms containing x to the left, all other terms to the right
-3x=30
x=30/-3
x=-10
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