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9x+4=-4x
We move all terms to the left:
9x+4-(-4x)=0
We get rid of parentheses
9x+4x+4=0
We add all the numbers together, and all the variables
13x+4=0
We move all terms containing x to the left, all other terms to the right
13x=-4
x=-4/13
x=-4/13
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