9r+7=21r+10

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Solution for 9r+7=21r+10 equation:


Simplifying
9r + 7 = 21r + 10

Reorder the terms:
7 + 9r = 21r + 10

Reorder the terms:
7 + 9r = 10 + 21r

Solving
7 + 9r = 10 + 21r

Solving for variable 'r'.

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

Add '-21r' to each side of the equation.
7 + 9r + -21r = 10 + 21r + -21r

Combine like terms: 9r + -21r = -12r
7 + -12r = 10 + 21r + -21r

Combine like terms: 21r + -21r = 0
7 + -12r = 10 + 0
7 + -12r = 10

Add '-7' to each side of the equation.
7 + -7 + -12r = 10 + -7

Combine like terms: 7 + -7 = 0
0 + -12r = 10 + -7
-12r = 10 + -7

Combine like terms: 10 + -7 = 3
-12r = 3

Divide each side by '-12'.
r = -0.25

Simplifying
r = -0.25

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