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76=3x+3x+4
We move all terms to the left:
76-(3x+3x+4)=0
We add all the numbers together, and all the variables
-(6x+4)+76=0
We get rid of parentheses
-6x-4+76=0
We add all the numbers together, and all the variables
-6x+72=0
We move all terms containing x to the left, all other terms to the right
-6x=-72
x=-72/-6
x=+12
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