7(7+2a)=-21

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


Simplifying
7(7 + 2a) = -21
(7 * 7 + 2a * 7) = -21
(49 + 14a) = -21

Solving
49 + 14a = -21

Solving for variable 'a'.

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

Add '-49' to each side of the equation.
49 + -49 + 14a = -21 + -49

Combine like terms: 49 + -49 = 0
0 + 14a = -21 + -49
14a = -21 + -49

Combine like terms: -21 + -49 = -70
14a = -70

Divide each side by '14'.
a = -5

Simplifying
a = -5

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