12+x=15+4

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Solution for 12+x=15+4 equation: 



12+x=15+4

We move all terms to the left:

12+x-(15+4)=0

We add all the numbers together, and all the variables

x+12-19=0

We add all the numbers together, and all the variables

x-7=0

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

x=7

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