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6.2x+13.8=2(3.1x+6.9)
We move all terms to the left:
6.2x+13.8-(2(3.1x+6.9))=0
We calculate terms in parentheses: -(2(3.1x+6.9)), so:We get rid of parentheses
2(3.1x+6.9)
We multiply parentheses
6x+13.8
Back to the equation:
-(6x+13.8)
6.2x-6x-13.8+13.8=0
We add all the numbers together, and all the variables
0.2x=0
x=0/0.2
x=0
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