a+20-5=7

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Solution for a+20-5=7 equation: 


Simplifying
a + 20 + -5 = 7

Reorder the terms:
20 + -5 + a = 7

Combine like terms: 20 + -5 = 15
15 + a = 7

Solving
15 + a = 7

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + a = 7 + -15

Combine like terms: 15 + -15 = 0
0 + a = 7 + -15
a = 7 + -15

Combine like terms: 7 + -15 = -8
a = -8

Simplifying
a = -8

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