2r-(r+3)=21

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Solution for 2r-(r+3)=21 equation:


Simplifying
2r + -1(r + 3) = 21

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

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

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

Solving
-3 + 1r = 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 + 1r = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 1r = 21 + 3
1r = 21 + 3

Combine like terms: 21 + 3 = 24
1r = 24

Divide each side by '1'.
r = 24

Simplifying
r = 24

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