-20=-1.25(1+x/120)

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Solution for -20=-1.25(1+x/120) equation: 



-20=-1.25(1+x/120)

We move all terms to the left:

-20-(-1.25(1+x/120))=0

We add all the numbers together, and all the variables

-(-1.25(x/120+1))-20=0

We multiply all the terms by the denominator


-(-1.25(x-20*120+1))=0



We calculate terms in parentheses: -(-1.25(x-20*120+1)), so:

-1.25(x-20*120+1)

We add all the numbers together, and all the variables

-1.25(x-2399)

We multiply parentheses

-1.25x+2998.75

Back to the equation:

-(-1.25x+2998.75)



We get rid of parentheses

1.25x-2998.75=0

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

1.25x=2998.75

x=2998.75/1.25

x=2399

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