0.4x-0.8x=-120

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Solution for 0.4x-0.8x=-120 equation: 



0.4x-0.8x=-120

We move all terms to the left:

0.4x-0.8x-(-120)=0

We add all the numbers together, and all the variables

-0.4x+120=0

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

-0.4x=-120

x=-120/-0.4

x=+300

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