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9x+4x+3+4=3x+3x+9x
We move all terms to the left:
9x+4x+3+4-(3x+3x+9x)=0
We add all the numbers together, and all the variables
9x+4x-(+15x)+3+4=0
We add all the numbers together, and all the variables
13x-(+15x)+7=0
We get rid of parentheses
13x-15x+7=0
We add all the numbers together, and all the variables
-2x+7=0
We move all terms containing x to the left, all other terms to the right
-2x=-7
x=-7/-2
x=3+1/2
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