7+2(a+3)=-9

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Solution for 7+2(a+3)=-9 equation: 


Simplifying
7 + 2(a + 3) = -9

Reorder the terms:
7 + 2(3 + a) = -9
7 + (3 * 2 + a * 2) = -9
7 + (6 + 2a) = -9

Combine like terms: 7 + 6 = 13
13 + 2a = -9

Solving
13 + 2a = -9

Solving for variable 'a'.

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

Add '-13' to each side of the equation.
13 + -13 + 2a = -9 + -13

Combine like terms: 13 + -13 = 0
0 + 2a = -9 + -13
2a = -9 + -13

Combine like terms: -9 + -13 = -22
2a = -22

Divide each side by '2'.
a = -11

Simplifying
a = -11

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