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1/3(x+6)+1/7(x+7)=x+9
We move all terms to the left:
1/3(x+6)+1/7(x+7)-(x+9)=0
Domain of the equation: 3(x+6)!=0
x∈R
Domain of the equation: 7(x+7)!=0We get rid of parentheses
x∈R
1/3(x+6)+1/7(x+7)-x-9=0
We calculate fractions
-x+(7xx/(3(x+6)*7(x+7))+(3xx/(3(x+6)*7(x+7))-9=0
We can not solve this equation
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