8x+12x=400

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Solution for 8x+12x=400 equation: 



8x+12x=400

We move all terms to the left:

8x+12x-(400)=0

We add all the numbers together, and all the variables

20x-400=0

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

20x=400

x=400/20

x=20

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