12=3x+21

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Solution for 12=3x+21 equation:



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

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