0.3x-x=120

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Solution for 0.3x-x=120 equation: 



0.3x-x=120

We move all terms to the left:

0.3x-x-(120)=0

We add all the numbers together, and all the variables

-0.7x-120=0

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

-0.7x=120

x=120/-0.7

x=-171+0.30000000000001/0.7

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