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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
-9x+4600=0
We move all terms containing x to the left, all other terms to the right
-9x=-4600
x=-4600/-9
x=511+1/9
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