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7-3x=4x-9
We move all terms to the left:
7-3x-(4x-9)=0
We get rid of parentheses
-3x-4x+9+7=0
We add all the numbers together, and all the variables
-7x+16=0
We move all terms containing x to the left, all other terms to the right
-7x=-16
x=-16/-7
x=2+2/7
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