9=5r+7

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Solution for 9=5r+7 equation:


Simplifying
9 = 5r + 7

Reorder the terms:
9 = 7 + 5r

Solving
9 = 7 + 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
9 + -5r = 7 + 5r + -5r

Combine like terms: 5r + -5r = 0
9 + -5r = 7 + 0
9 + -5r = 7

Add '-9' to each side of the equation.
9 + -9 + -5r = 7 + -9

Combine like terms: 9 + -9 = 0
0 + -5r = 7 + -9
-5r = 7 + -9

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

Divide each side by '-5'.
r = 0.4

Simplifying
r = 0.4

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