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54+12=2(2.7x-9)
We move all terms to the left:
54+12-(2(2.7x-9))=0
We add all the numbers together, and all the variables
-(2(2.7x-9))+66=0
We calculate terms in parentheses: -(2(2.7x-9)), so:We get rid of parentheses
2(2.7x-9)
We multiply parentheses
4x-18
Back to the equation:
-(4x-18)
-4x+18+66=0
We add all the numbers together, and all the variables
-4x+84=0
We move all terms containing x to the left, all other terms to the right
-4x=-84
x=-84/-4
x=+21
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