2r-21=3-4r

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Solution for 2r-21=3-4r equation:


Simplifying
2r + -21 = 3 + -4r

Reorder the terms:
-21 + 2r = 3 + -4r

Solving
-21 + 2r = 3 + -4r

Solving for variable 'r'.

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

Add '4r' to each side of the equation.
-21 + 2r + 4r = 3 + -4r + 4r

Combine like terms: 2r + 4r = 6r
-21 + 6r = 3 + -4r + 4r

Combine like terms: -4r + 4r = 0
-21 + 6r = 3 + 0
-21 + 6r = 3

Add '21' to each side of the equation.
-21 + 21 + 6r = 3 + 21

Combine like terms: -21 + 21 = 0
0 + 6r = 3 + 21
6r = 3 + 21

Combine like terms: 3 + 21 = 24
6r = 24

Divide each side by '6'.
r = 4

Simplifying
r = 4

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