-5+2(1+6r)=21

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Solution for -5+2(1+6r)=21 equation:


Simplifying
-5 + 2(1 + 6r) = 21
-5 + (1 * 2 + 6r * 2) = 21
-5 + (2 + 12r) = 21

Combine like terms: -5 + 2 = -3
-3 + 12r = 21

Solving
-3 + 12r = 21

Solving for variable 'r'.

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

Add '3' to each side of the equation.
-3 + 3 + 12r = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 12r = 21 + 3
12r = 21 + 3

Combine like terms: 21 + 3 = 24
12r = 24

Divide each side by '12'.
r = 2

Simplifying
r = 2

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