-1+4(1-5r)=123

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Solution for -1+4(1-5r)=123 equation: 



-1+4(1-5r)=123

We move all terms to the left:

-1+4(1-5r)-(123)=0

We add all the numbers together, and all the variables

4(-5r+1)-1-123=0

We add all the numbers together, and all the variables

4(-5r+1)-124=0

We multiply parentheses

-20r+4-124=0

We add all the numbers together, and all the variables

-20r-120=0

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

-20r=120

r=120/-20

r=-6

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