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3x+(3x+5)=500
We move all terms to the left:
3x+(3x+5)-(500)=0
We get rid of parentheses
3x+3x+5-500=0
We add all the numbers together, and all the variables
6x-495=0
We move all terms containing x to the left, all other terms to the right
6x=495
x=495/6
x=82+1/2
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