2r+7r-5r=400

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Solution for 2r+7r-5r=400 equation: 


Simplifying
2r + 7r + -5r = 400

Combine like terms: 2r + 7r = 9r
9r + -5r = 400

Combine like terms: 9r + -5r = 4r
4r = 400

Solving
4r = 400

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '4'.
r = 100

Simplifying
r = 100

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