6-7a-7a=20

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Solution for 6-7a-7a=20 equation: 


Simplifying
6 + -7a + -7a = 20

Combine like terms: -7a + -7a = -14a
6 + -14a = 20

Solving
6 + -14a = 20

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + -14a = 20 + -6

Combine like terms: 6 + -6 = 0
0 + -14a = 20 + -6
-14a = 20 + -6

Combine like terms: 20 + -6 = 14
-14a = 14

Divide each side by '-14'.
a = -1

Simplifying
a = -1

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