21*4=12*x

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Solution for 21*4=12*x equation: 



21*4=12x

We move all terms to the left:

21*4-(12x)=0

We add all the numbers together, and all the variables

-12x+84=0

We move all terms containing x to the left, all other terms to the right

-12x=-84

x=-84/-12

x=+7

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