-9-4x=-21-7x

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Solution for -9-4x=-21-7x equation:



-9-4x=-21-7x
We move all terms to the left:
-9-4x-(-21-7x)=0
We add all the numbers together, and all the variables
-4x-(-7x-21)-9=0
We get rid of parentheses
-4x+7x+21-9=0
We add all the numbers together, and all the variables
3x+12=0
We move all terms containing x to the left, all other terms to the right
3x=-12
x=-12/3
x=-4

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