21r-(7r+14)=28

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Solution for 21r-(7r+14)=28 equation:


Simplifying
21r + -1(7r + 14) = 28

Reorder the terms:
21r + -1(14 + 7r) = 28
21r + (14 * -1 + 7r * -1) = 28
21r + (-14 + -7r) = 28

Reorder the terms:
-14 + 21r + -7r = 28

Combine like terms: 21r + -7r = 14r
-14 + 14r = 28

Solving
-14 + 14r = 28

Solving for variable 'r'.

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

Add '14' to each side of the equation.
-14 + 14 + 14r = 28 + 14

Combine like terms: -14 + 14 = 0
0 + 14r = 28 + 14
14r = 28 + 14

Combine like terms: 28 + 14 = 42
14r = 42

Divide each side by '14'.
r = 3

Simplifying
r = 3

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