1r+3+2r=-21

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Solution for 1r+3+2r=-21 equation:


Simplifying
1r + 3 + 2r = -21

Reorder the terms:
3 + 1r + 2r = -21

Combine like terms: 1r + 2r = 3r
3 + 3r = -21

Solving
3 + 3r = -21

Solving for variable 'r'.

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

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 = -24
3r = -24

Divide each side by '3'.
r = -8

Simplifying
r = -8

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