3r+21=10r

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Solution for 3r+21=10r equation:


Simplifying
3r + 21 = 10r

Reorder the terms:
21 + 3r = 10r

Solving
21 + 3r = 10r

Solving for variable 'r'.

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

Add '-10r' to each side of the equation.
21 + 3r + -10r = 10r + -10r

Combine like terms: 3r + -10r = -7r
21 + -7r = 10r + -10r

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

Add '-21' to each side of the equation.
21 + -21 + -7r = 0 + -21

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

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

Divide each side by '-7'.
r = 3

Simplifying
r = 3

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