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5x-42=-2(4x+8)
We move all terms to the left:
5x-42-(-2(4x+8))=0
We calculate terms in parentheses: -(-2(4x+8)), so:We get rid of parentheses
-2(4x+8)
We multiply parentheses
-8x-16
Back to the equation:
-(-8x-16)
5x+8x+16-42=0
We add all the numbers together, and all the variables
13x-26=0
We move all terms containing x to the left, all other terms to the right
13x=26
x=26/13
x=2
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