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5x+1=-2(x+10)
We move all terms to the left:
5x+1-(-2(x+10))=0
We calculate terms in parentheses: -(-2(x+10)), so:We get rid of parentheses
-2(x+10)
We multiply parentheses
-2x-20
Back to the equation:
-(-2x-20)
5x+2x+20+1=0
We add all the numbers together, and all the variables
7x+21=0
We move all terms containing x to the left, all other terms to the right
7x=-21
x=-21/7
x=-3
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