7r-3=-21+9r

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Solution for 7r-3=-21+9r equation:


Simplifying
7r + -3 = -21 + 9r

Reorder the terms:
-3 + 7r = -21 + 9r

Solving
-3 + 7r = -21 + 9r

Solving for variable 'r'.

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

Add '-9r' to each side of the equation.
-3 + 7r + -9r = -21 + 9r + -9r

Combine like terms: 7r + -9r = -2r
-3 + -2r = -21 + 9r + -9r

Combine like terms: 9r + -9r = 0
-3 + -2r = -21 + 0
-3 + -2r = -21

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

Combine like terms: -3 + 3 = 0
0 + -2r = -21 + 3
-2r = -21 + 3

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

Divide each side by '-2'.
r = 9

Simplifying
r = 9

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