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X(8.7+9.9)=X+27.9
We move all terms to the left:
X(8.7+9.9)-(X+27.9)=0
We add all the numbers together, and all the variables
X(18.6)-(X+27.9)=0
We multiply parentheses
18.6X-(X+27.9)=0
We get rid of parentheses
18.6X-X-27.9=0
We add all the numbers together, and all the variables
17.6X-27.9=0
We move all terms containing X to the left, all other terms to the right
17.6X=27.9
X=27.9/17.6
X=1+7.92307692308/13.5384615385
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