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7x+3(2x+1)=5
We move all terms to the left:
7x+3(2x+1)-(5)=0
We multiply parentheses
7x+6x+3-5=0
We add all the numbers together, and all the variables
13x-2=0
We move all terms containing x to the left, all other terms to the right
13x=2
x=2/13
x=2/13
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