7(1+2a)=-21

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Solution for 7(1+2a)=-21 equation: 


Simplifying
7(1 + 2a) = -21
(1 * 7 + 2a * 7) = -21
(7 + 14a) = -21

Solving
7 + 14a = -21

Solving for variable 'a'.

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

Add '-7' to each side of the equation.
7 + -7 + 14a = -21 + -7

Combine like terms: 7 + -7 = 0
0 + 14a = -21 + -7
14a = -21 + -7

Combine like terms: -21 + -7 = -28
14a = -28

Divide each side by '14'.
a = -2

Simplifying
a = -2

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