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5x+2(2x+5)=13
We move all terms to the left:
5x+2(2x+5)-(13)=0
We multiply parentheses
5x+4x+10-13=0
We add all the numbers together, and all the variables
9x-3=0
We move all terms containing x to the left, all other terms to the right
9x=3
x=3/9
x=1/3
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