4x+21=12

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Solution for 4x+21=12 equation: 



4x+21=12

We move all terms to the left:

4x+21-(12)=0

We add all the numbers together, and all the variables

4x+9=0

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

4x=-9

x=-9/4

x=-2+1/4

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