6r-21=3(3+7r)

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Solution for 6r-21=3(3+7r) equation:


Simplifying
6r + -21 = 3(3 + 7r)

Reorder the terms:
-21 + 6r = 3(3 + 7r)
-21 + 6r = (3 * 3 + 7r * 3)
-21 + 6r = (9 + 21r)

Solving
-21 + 6r = 9 + 21r

Solving for variable 'r'.

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

Add '-21r' to each side of the equation.
-21 + 6r + -21r = 9 + 21r + -21r

Combine like terms: 6r + -21r = -15r
-21 + -15r = 9 + 21r + -21r

Combine like terms: 21r + -21r = 0
-21 + -15r = 9 + 0
-21 + -15r = 9

Add '21' to each side of the equation.
-21 + 21 + -15r = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -15r = 9 + 21
-15r = 9 + 21

Combine like terms: 9 + 21 = 30
-15r = 30

Divide each side by '-15'.
r = -2

Simplifying
r = -2

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