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3(7+2x)=x(4+9)
We move all terms to the left:
3(7+2x)-(x(4+9))=0
We add all the numbers together, and all the variables
3(2x+7)-(x13)=0
We add all the numbers together, and all the variables
-1x^13+3(2x+7)=0
We multiply parentheses
-1x^13+6x+21=0
We do not support expression: x^13
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