7x+21=4x-4

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



7x+21=4x-4

We move all terms to the left:

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

We get rid of parentheses

7x-4x+4+21=0

We add all the numbers together, and all the variables

3x+25=0

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

3x=-25

x=-25/3

x=-8+1/3

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