8(8-7r)=400

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Solution for 8(8-7r)=400 equation: 



8(8-7r)=400

We move all terms to the left:

8(8-7r)-(400)=0

We add all the numbers together, and all the variables

8(-7r+8)-400=0

We multiply parentheses

-56r+64-400=0

We add all the numbers together, and all the variables

-56r-336=0

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

-56r=336

r=336/-56

r=-6

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