3x=15+21

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Solution for 3x=15+21 equation:



3x=15+21
We move all terms to the left:
3x-(15+21)=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12

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