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x+9=-90+4x
We move all terms to the left:
x+9-(-90+4x)=0
We add all the numbers together, and all the variables
x-(4x-90)+9=0
We get rid of parentheses
x-4x+90+9=0
We add all the numbers together, and all the variables
-3x+99=0
We move all terms containing x to the left, all other terms to the right
-3x=-99
x=-99/-3
x=+33
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