12x+15x+4x=100

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Solution for 12x+15x+4x=100 equation: 



12x+15x+4x=100

We move all terms to the left:

12x+15x+4x-(100)=0

We add all the numbers together, and all the variables

31x-100=0

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

31x=100

x=100/31

x=3+7/31

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