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7x-4=3+9x
We move all terms to the left:
7x-4-(3+9x)=0
We add all the numbers together, and all the variables
7x-(9x+3)-4=0
We get rid of parentheses
7x-9x-3-4=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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