13,400=0.10x+.07(155,000-x)

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Solution for 13,400=0.10x+.07(155,000-x) equation: 



13.400=0.10x+.07(155.000-x)

We move all terms to the left:

13.400-(0.10x+.07(155.000-x))=0

We add all the numbers together, and all the variables

-(0.10x+.07(-1x+155))+13.400=0

We add all the numbers together, and all the variables

-(0.10x+.07(-1x+155))+13.4=0



We calculate terms in parentheses: -(0.10x+.07(-1x+155)), so:

0.10x+.07(-1x+155)

We multiply parentheses

0.10x-0.07x+10.85

We add all the numbers together, and all the variables

0.03x+10.85

Back to the equation:

-(0.03x+10.85)



We get rid of parentheses

-0.03x-10.85+13.4=0

We add all the numbers together, and all the variables

-0.03x+2.55=0

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

-0.03x=-2.55

x=-2.55/-0.03

x=+85

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