(x+5)*0.8+(40-x)=40

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Solution for (x+5)*0.8+(40-x)=40 equation: 



(x+5)*0.8+(40-x)=40

We move all terms to the left:

(x+5)*0.8+(40-x)-(40)=0

We add all the numbers together, and all the variables

(x+5)*0.8+(-1x+40)-40=0

We multiply parentheses

0.8x+(-1x+40)+4-40=0

We get rid of parentheses

0.8x-1x+40+4-40=0

We add all the numbers together, and all the variables

-0.2x+4=0

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

-0.2x=-4

x=-4/-0.2

x=+20

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