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2(5x+6)=-21+13
We move all terms to the left:
2(5x+6)-(-21+13)=0
We add all the numbers together, and all the variables
2(5x+6)-(-8)=0
We add all the numbers together, and all the variables
2(5x+6)+8=0
We multiply parentheses
10x+12+8=0
We add all the numbers together, and all the variables
10x+20=0
We move all terms containing x to the left, all other terms to the right
10x=-20
x=-20/10
x=-2
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