20=7+a

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Solution for 20=7+a equation:


Simplifying
20 = 7 + a

Solving
20 = 7 + 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 = 7 + a + -1a

Combine like terms: a + -1a = 0
20 + -1a = 7 + 0
20 + -1a = 7

Add '-20' to each side of the equation.
20 + -20 + -1a = 7 + -20

Combine like terms: 20 + -20 = 0
0 + -1a = 7 + -20
-1a = 7 + -20

Combine like terms: 7 + -20 = -13
-1a = -13

Divide each side by '-1'.
a = 13

Simplifying
a = 13

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