100(x-9)=80(x+9)

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Solution for 100(x-9)=80(x+9) equation: 



100(x-9)=80(x+9)

We move all terms to the left:

100(x-9)-(80(x+9))=0

We multiply parentheses

100x-(80(x+9))-900=0



We calculate terms in parentheses: -(80(x+9)), so:

80(x+9)

We multiply parentheses

80x+720

Back to the equation:

-(80x+720)



We get rid of parentheses

100x-80x-720-900=0

We add all the numbers together, and all the variables

20x-1620=0

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

20x=1620

x=1620/20

x=81

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