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-189=-9(3+x)
We move all terms to the left:
-189-(-9(3+x))=0
We add all the numbers together, and all the variables
-(-9(x+3))-189=0
We calculate terms in parentheses: -(-9(x+3)), so:We get rid of parentheses
-9(x+3)
We multiply parentheses
-9x-27
Back to the equation:
-(-9x-27)
9x+27-189=0
We add all the numbers together, and all the variables
9x-162=0
We move all terms containing x to the left, all other terms to the right
9x=162
x=162/9
x=18
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