5+2r-2=7r+21-2r

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Solution for 5+2r-2=7r+21-2r equation:


Simplifying
5 + 2r + -2 = 7r + 21 + -2r

Reorder the terms:
5 + -2 + 2r = 7r + 21 + -2r

Combine like terms: 5 + -2 = 3
3 + 2r = 7r + 21 + -2r

Reorder the terms:
3 + 2r = 21 + 7r + -2r

Combine like terms: 7r + -2r = 5r
3 + 2r = 21 + 5r

Solving
3 + 2r = 21 + 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.
3 + 2r + -5r = 21 + 5r + -5r

Combine like terms: 2r + -5r = -3r
3 + -3r = 21 + 5r + -5r

Combine like terms: 5r + -5r = 0
3 + -3r = 21 + 0
3 + -3r = 21

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

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

Combine like terms: 21 + -3 = 18
-3r = 18

Divide each side by '-3'.
r = -6

Simplifying
r = -6

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