-3(x+7)=-9x+21

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Solution for -3(x+7)=-9x+21 equation:



-3(x+7)=-9x+21
We move all terms to the left:
-3(x+7)-(-9x+21)=0
We multiply parentheses
-3x-(-9x+21)-21=0
We get rid of parentheses
-3x+9x-21-21=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7

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