13=a-7.7

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Solution for 13=a-7.7 equation:


Simplifying
13 = a + -7.7

Reorder the terms:
13 = -7.7 + a

Solving
13 = -7.7 + 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.
13 + -1a = -7.7 + a + -1a

Combine like terms: a + -1a = 0
13 + -1a = -7.7 + 0
13 + -1a = -7.7

Add '-13' to each side of the equation.
13 + -13 + -1a = -7.7 + -13

Combine like terms: 13 + -13 = 0
0 + -1a = -7.7 + -13
-1a = -7.7 + -13

Combine like terms: -7.7 + -13 = -20.7
-1a = -20.7

Divide each side by '-1'.
a = 20.7

Simplifying
a = 20.7

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