a+(a-2)=40

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Solution for a+(a-2)=40 equation:


Simplifying
a + (a + -2) = 40

Reorder the terms:
a + (-2 + a) = 40

Remove parenthesis around (-2 + a)
a + -2 + a = 40

Reorder the terms:
-2 + a + a = 40

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

Solving
-2 + 2a = 40

Solving for variable 'a'.

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

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

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

Combine like terms: 40 + 2 = 42
2a = 42

Divide each side by '2'.
a = 21

Simplifying
a = 21

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