3x+12=X-5

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Solution for 3x+12=X-5 equation: 



3x+12=x-5

We move all terms to the left:

3x+12-(x-5)=0

We get rid of parentheses

3x-x+5+12=0

We add all the numbers together, and all the variables

2x+17=0

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

2x=-17

x=-17/2

x=-8+1/2

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