x+x+12=300

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Solution for x+x+12=300 equation: 



x+x+12=300

We move all terms to the left:

x+x+12-(300)=0

We add all the numbers together, and all the variables

2x-288=0

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

2x=288

x=288/2

x=144

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