7(2r-3)=21

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Solution for 7(2r-3)=21 equation: 


Simplifying
7(2r + -3) = 21

Reorder the terms:
7(-3 + 2r) = 21
(-3 * 7 + 2r * 7) = 21
(-21 + 14r) = 21

Solving
-21 + 14r = 21

Solving for variable 'r'.

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

Add '21' to each side of the equation.
-21 + 21 + 14r = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 14r = 21 + 21
14r = 21 + 21

Combine like terms: 21 + 21 = 42
14r = 42

Divide each side by '14'.
r = 3

Simplifying
r = 3

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