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