200-0.4x-x=80

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Solution for 200-0.4x-x=80 equation: 



200-0.4x-x=80

We move all terms to the left:

200-0.4x-x-(80)=0

We add all the numbers together, and all the variables

-1.4x+120=0

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

-1.4x=-120

x=-120/-1.4

x=85+1/1.4

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