-x+3=12+6

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Solution for -x+3=12+6 equation: 



-x+3=12+6

We move all terms to the left:

-x+3-(12+6)=0

We add all the numbers together, and all the variables

-x+3-18=0

We add all the numbers together, and all the variables

-1x-15=0

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

-x=15

x=15/-1

x=-15

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