(12-9)+x=7

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Solution for (12-9)+x=7 equation: 



(12-9)+x=7

We move all terms to the left:

(12-9)+x-(7)=0

determiningTheFunctionDomain
x-7+(12-9)=0

We add all the numbers together, and all the variables

x-7+3=0

We add all the numbers together, and all the variables

x-4=0

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

x=4

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