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160=-8(5+4x)+7x
We move all terms to the left:
160-(-8(5+4x)+7x)=0
We add all the numbers together, and all the variables
-(-8(4x+5)+7x)+160=0
We calculate terms in parentheses: -(-8(4x+5)+7x), so:We get rid of parentheses
-8(4x+5)+7x
We add all the numbers together, and all the variables
7x-8(4x+5)
We multiply parentheses
7x-32x-40
We add all the numbers together, and all the variables
-25x-40
Back to the equation:
-(-25x-40)
25x+40+160=0
We add all the numbers together, and all the variables
25x+200=0
We move all terms containing x to the left, all other terms to the right
25x=-200
x=-200/25
x=-8
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