-20=-15+a

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Solution for -20=-15+a equation:


Simplifying
-20 = -15 + a

Solving
-20 = -15 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-20 + -1a = -15 + a + -1a

Combine like terms: a + -1a = 0
-20 + -1a = -15 + 0
-20 + -1a = -15

Add '20' to each side of the equation.
-20 + 20 + -1a = -15 + 20

Combine like terms: -20 + 20 = 0
0 + -1a = -15 + 20
-1a = -15 + 20

Combine like terms: -15 + 20 = 5
-1a = 5

Divide each side by '-1'.
a = -5

Simplifying
a = -5

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