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(2x+1)7=3
We move all terms to the left:
(2x+1)7-(3)=0
We multiply parentheses
14x+7-3=0
We add all the numbers together, and all the variables
14x+4=0
We move all terms containing x to the left, all other terms to the right
14x=-4
x=-4/14
x=-2/7
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