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5x+4=-2(x-9)
We move all terms to the left:
5x+4-(-2(x-9))=0
We calculate terms in parentheses: -(-2(x-9)), so:We get rid of parentheses
-2(x-9)
We multiply parentheses
-2x+18
Back to the equation:
-(-2x+18)
5x+2x-18+4=0
We add all the numbers together, and all the variables
7x-14=0
We move all terms containing x to the left, all other terms to the right
7x=14
x=14/7
x=2
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