(a+13)+(a-7)=180

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Solution for (a+13)+(a-7)=180 equation:


Simplifying
(a + 13) + (a + -7) = 180

Reorder the terms:
(13 + a) + (a + -7) = 180

Remove parenthesis around (13 + a)
13 + a + (a + -7) = 180

Reorder the terms:
13 + a + (-7 + a) = 180

Remove parenthesis around (-7 + a)
13 + a + -7 + a = 180

Reorder the terms:
13 + -7 + a + a = 180

Combine like terms: 13 + -7 = 6
6 + a + a = 180

Combine like terms: a + a = 2a
6 + 2a = 180

Solving
6 + 2a = 180

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + 2a = 180 + -6

Combine like terms: 6 + -6 = 0
0 + 2a = 180 + -6
2a = 180 + -6

Combine like terms: 180 + -6 = 174
2a = 174

Divide each side by '2'.
a = 87

Simplifying
a = 87

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