0.3*(800-x)+0.04*x=84

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Solution for 0.3*(800-x)+0.04*x=84 equation: 



0.3(800-x)+0.04x=84

We move all terms to the left:

0.3(800-x)+0.04x-(84)=0

We add all the numbers together, and all the variables

0.3(-1x+800)+0.04x-84=0

We add all the numbers together, and all the variables

0.04x+0.3(-1x+800)-84=0

We multiply parentheses

0.04x-0.3x+240-84=0

We add all the numbers together, and all the variables

-0.26x+156=0

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

-0.26x=-156

x=-156/-0.26

x=+600

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