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343=-8(-5x-2)+7
We move all terms to the left:
343-(-8(-5x-2)+7)=0
We calculate terms in parentheses: -(-8(-5x-2)+7), so:We get rid of parentheses
-8(-5x-2)+7
We multiply parentheses
40x+16+7
We add all the numbers together, and all the variables
40x+23
Back to the equation:
-(40x+23)
-40x-23+343=0
We add all the numbers together, and all the variables
-40x+320=0
We move all terms containing x to the left, all other terms to the right
-40x=-320
x=-320/-40
x=+8
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