4+x=7-12

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Solution for 4+x=7-12 equation: 



4+x=7-12

We move all terms to the left:

4+x-(7-12)=0

We add all the numbers together, and all the variables

x+4-(-5)=0

We add all the numbers together, and all the variables

x+9=0

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

x=-9

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