12x+21=7x-4

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Solution for 12x+21=7x-4 equation: 



12x+21=7x-4

We move all terms to the left:

12x+21-(7x-4)=0

We get rid of parentheses

12x-7x+4+21=0

We add all the numbers together, and all the variables

5x+25=0

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

5x=-25

x=-25/5

x=-5

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