-21=7(3r+8)

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Solution for -21=7(3r+8) equation:


Simplifying
-21 = 7(3r + 8)

Reorder the terms:
-21 = 7(8 + 3r)
-21 = (8 * 7 + 3r * 7)
-21 = (56 + 21r)

Solving
-21 = 56 + 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 + -21r = 56 + 21r + -21r

Combine like terms: 21r + -21r = 0
-21 + -21r = 56 + 0
-21 + -21r = 56

Add '21' to each side of the equation.
-21 + 21 + -21r = 56 + 21

Combine like terms: -21 + 21 = 0
0 + -21r = 56 + 21
-21r = 56 + 21

Combine like terms: 56 + 21 = 77
-21r = 77

Divide each side by '-21'.
r = -3.666666667

Simplifying
r = -3.666666667

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