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400+3x=-5000-12x
We move all terms to the left:
400+3x-(-5000-12x)=0
We add all the numbers together, and all the variables
3x-(-12x-5000)+400=0
We get rid of parentheses
3x+12x+5000+400=0
We add all the numbers together, and all the variables
15x+5400=0
We move all terms containing x to the left, all other terms to the right
15x=-5400
x=-5400/15
x=-360
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