20=13-7a

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Solution for 20=13-7a equation:


Simplifying
20 = 13 + -7a

Solving
20 = 13 + -7a

Solving for variable 'a'.

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

Add '7a' to each side of the equation.
20 + 7a = 13 + -7a + 7a

Combine like terms: -7a + 7a = 0
20 + 7a = 13 + 0
20 + 7a = 13

Add '-20' to each side of the equation.
20 + -20 + 7a = 13 + -20

Combine like terms: 20 + -20 = 0
0 + 7a = 13 + -20
7a = 13 + -20

Combine like terms: 13 + -20 = -7
7a = -7

Divide each side by '7'.
a = -1

Simplifying
a = -1

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