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5x+4x+3=-4x
We move all terms to the left:
5x+4x+3-(-4x)=0
We add all the numbers together, and all the variables
9x-(-4x)+3=0
We get rid of parentheses
9x+4x+3=0
We add all the numbers together, and all the variables
13x+3=0
We move all terms containing x to the left, all other terms to the right
13x=-3
x=-3/13
x=-3/13
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