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-7(x+3)x27=9-8x
We move all terms to the left:
-7(x+3)x27-(9-8x)=0
We add all the numbers together, and all the variables
-7(x+3)x27-(-8x+9)=0
We multiply parentheses
-7x^28-21x^27-(-8x+9)=0
We get rid of parentheses
-7x^28-21x^27+8x-9=0
We do not support expression: x^28
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