9-(-11)-7a=-1

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Solution for 9-(-11)-7a=-1 equation:


Simplifying
9 + -1(-11) + -7a = -1

Multiply -1 * -11
9 + 11 + -7a = -1

Combine like terms: 9 + 11 = 20
20 + -7a = -1

Solving
20 + -7a = -1

Solving for variable 'a'.

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

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

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

Combine like terms: -1 + -20 = -21
-7a = -21

Divide each side by '-7'.
a = 3

Simplifying
a = 3

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