3x+21=7-4

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Solution for 3x+21=7-4 equation: 



3x+21=7-4

We move all terms to the left:

3x+21-(7-4)=0

We add all the numbers together, and all the variables

3x+21-3=0

We add all the numbers together, and all the variables

3x+18=0

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

3x=-18

x=-18/3

x=-6

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