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-5(4-x)=-8(x+9)
We move all terms to the left:
-5(4-x)-(-8(x+9))=0
We add all the numbers together, and all the variables
-5(-1x+4)-(-8(x+9))=0
We multiply parentheses
5x-(-8(x+9))-20=0
We calculate terms in parentheses: -(-8(x+9)), so:We get rid of parentheses
-8(x+9)
We multiply parentheses
-8x-72
Back to the equation:
-(-8x-72)
5x+8x+72-20=0
We add all the numbers together, and all the variables
13x+52=0
We move all terms containing x to the left, all other terms to the right
13x=-52
x=-52/13
x=-4
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