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2(21x+8)=13x-6
We move all terms to the left:
2(21x+8)-(13x-6)=0
We multiply parentheses
42x-(13x-6)+16=0
We get rid of parentheses
42x-13x+6+16=0
We add all the numbers together, and all the variables
29x+22=0
We move all terms containing x to the left, all other terms to the right
29x=-22
x=-22/29
x=-22/29
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