3r-21=-18+2r

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Solution for 3r-21=-18+2r equation:


Simplifying
3r + -21 = -18 + 2r

Reorder the terms:
-21 + 3r = -18 + 2r

Solving
-21 + 3r = -18 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
-21 + 3r + -2r = -18 + 2r + -2r

Combine like terms: 3r + -2r = 1r
-21 + 1r = -18 + 2r + -2r

Combine like terms: 2r + -2r = 0
-21 + 1r = -18 + 0
-21 + 1r = -18

Add '21' to each side of the equation.
-21 + 21 + 1r = -18 + 21

Combine like terms: -21 + 21 = 0
0 + 1r = -18 + 21
1r = -18 + 21

Combine like terms: -18 + 21 = 3
1r = 3

Divide each side by '1'.
r = 3

Simplifying
r = 3

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