3+12-x=7

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Solution for 3+12-x=7 equation: 



3+12-x=7

We move all terms to the left:

3+12-x-(7)=0

We add all the numbers together, and all the variables

-1x+8=0

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

-x=-8

x=-8/-1

x=+8

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