(a+20)-(a-20)=

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Solution for (a+20)-(a-20)= equation: 


Simplifying
(a + 20) + -1(a + -20) = 0

Reorder the terms:
(20 + a) + -1(a + -20) = 0

Remove parenthesis around (20 + a)
20 + a + -1(a + -20) = 0

Reorder the terms:
20 + a + -1(-20 + a) = 0
20 + a + (-20 * -1 + a * -1) = 0
20 + a + (20 + -1a) = 0

Reorder the terms:
20 + 20 + a + -1a = 0

Combine like terms: 20 + 20 = 40
40 + a + -1a = 0

Combine like terms: a + -1a = 0
40 + 0 = 0
40 = 0

Solving
40 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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