8r-21=-21+7r

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Solution for 8r-21=-21+7r equation:


Simplifying
8r + -21 = -21 + 7r

Reorder the terms:
-21 + 8r = -21 + 7r

Add '21' to each side of the equation.
-21 + 21 + 8r = -21 + 21 + 7r

Combine like terms: -21 + 21 = 0
0 + 8r = -21 + 21 + 7r
8r = -21 + 21 + 7r

Combine like terms: -21 + 21 = 0
8r = 0 + 7r
8r = 7r

Solving
8r = 7r

Solving for variable 'r'.

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

Add '-7r' to each side of the equation.
8r + -7r = 7r + -7r

Combine like terms: 8r + -7r = 1r
1r = 7r + -7r

Combine like terms: 7r + -7r = 0
1r = 0

Divide each side by '1'.
r = 0

Simplifying
r = 0

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