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3(x+7)-3=5x+4
We move all terms to the left:
3(x+7)-3-(5x+4)=0
We multiply parentheses
3x-(5x+4)+21-3=0
We get rid of parentheses
3x-5x-4+21-3=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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