9x2-18x-7=9x2-21x+3x-7

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Solution for 9x2-18x-7=9x2-21x+3x-7 equation: 



9x^2-18x-7=9x^2-21x+3x-7

We move all terms to the left:

9x^2-18x-7-(9x^2-21x+3x-7)=0

We get rid of parentheses

9x^2-9x^2-18x+21x-3x+7-7=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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