.3x+x=100

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Solution for .3x+x=100 equation: 



.3x+x=100

We move all terms to the left:

.3x+x-(100)=0

We add all the numbers together, and all the variables

1.3x-100=0

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

1.3x=100

x=100/1.3

x=76+1/1.0833333333333

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