2(1+3r)=-21

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Solution for 2(1+3r)=-21 equation: 


Simplifying
2(1 + 3r) = -21
(1 * 2 + 3r * 2) = -21
(2 + 6r) = -21

Solving
2 + 6r = -21

Solving for variable 'r'.

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

Add '-2' to each side of the equation.
2 + -2 + 6r = -21 + -2

Combine like terms: 2 + -2 = 0
0 + 6r = -21 + -2
6r = -21 + -2

Combine like terms: -21 + -2 = -23
6r = -23

Divide each side by '6'.
r = -3.833333333

Simplifying
r = -3.833333333

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