7x+2x=2x-21

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Solution for 7x+2x=2x-21 equation:



7x+2x=2x-21
We move all terms to the left:
7x+2x-(2x-21)=0
We add all the numbers together, and all the variables
9x-(2x-21)=0
We get rid of parentheses
9x-2x+21=0
We add all the numbers together, and all the variables
7x+21=0
We move all terms containing x to the left, all other terms to the right
7x=-21
x=-21/7
x=-3

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