7x-(-2x-3)=21

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Solution for 7x-(-2x-3)=21 equation:



7x-(-2x-3)=21
We move all terms to the left:
7x-(-2x-3)-(21)=0
We get rid of parentheses
7x+2x+3-21=0
We add all the numbers together, and all the variables
9x-18=0
We move all terms containing x to the left, all other terms to the right
9x=18
x=18/9
x=2

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