-.4x+8+.2x=18

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Solution for -.4x+8+.2x=18 equation: 



-.4x+8+.2x=18

We move all terms to the left:

-.4x+8+.2x-(18)=0

We add all the numbers together, and all the variables

-0.2x-10=0

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

-0.2x=10

x=10/-0.2

x=-50

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