(r-2)+(2r+1)=8

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Solution for (r-2)+(2r+1)=8 equation:


Simplifying
(r + -2) + (2r + 1) = 8

Reorder the terms:
(-2 + r) + (2r + 1) = 8

Remove parenthesis around (-2 + r)
-2 + r + (2r + 1) = 8

Reorder the terms:
-2 + r + (1 + 2r) = 8

Remove parenthesis around (1 + 2r)
-2 + r + 1 + 2r = 8

Reorder the terms:
-2 + 1 + r + 2r = 8

Combine like terms: -2 + 1 = -1
-1 + r + 2r = 8

Combine like terms: r + 2r = 3r
-1 + 3r = 8

Solving
-1 + 3r = 8

Solving for variable 'r'.

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

Add '1' to each side of the equation.
-1 + 1 + 3r = 8 + 1

Combine like terms: -1 + 1 = 0
0 + 3r = 8 + 1
3r = 8 + 1

Combine like terms: 8 + 1 = 9
3r = 9

Divide each side by '3'.
r = 3

Simplifying
r = 3

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