a+(a-40)=180

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Solution for a+(a-40)=180 equation:


Simplifying
a + (a + -40) = 180

Reorder the terms:
a + (-40 + a) = 180

Remove parenthesis around (-40 + a)
a + -40 + a = 180

Reorder the terms:
-40 + a + a = 180

Combine like terms: a + a = 2a
-40 + 2a = 180

Solving
-40 + 2a = 180

Solving for variable 'a'.

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

Add '40' to each side of the equation.
-40 + 40 + 2a = 180 + 40

Combine like terms: -40 + 40 = 0
0 + 2a = 180 + 40
2a = 180 + 40

Combine like terms: 180 + 40 = 220
2a = 220

Divide each side by '2'.
a = 110

Simplifying
a = 110

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