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6x+3(2x+1)=7x+13
We move all terms to the left:
6x+3(2x+1)-(7x+13)=0
We multiply parentheses
6x+6x-(7x+13)+3=0
We get rid of parentheses
6x+6x-7x-13+3=0
We add all the numbers together, and all the variables
5x-10=0
We move all terms containing x to the left, all other terms to the right
5x=10
x=10/5
x=2
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