8x-7=4x-21

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Solution for 8x-7=4x-21 equation: 



8x-7=4x-21

We move all terms to the left:

8x-7-(4x-21)=0

We get rid of parentheses

8x-4x+21-7=0

We add all the numbers together, and all the variables

4x+14=0

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

4x=-14

x=-14/4

x=-3+1/2

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