51-(7a+9)=

Solution for 51-(7a+9)= equation:

Simplifying
51 + -1(7a + 9) = 0

Reorder the terms:
51 + -1(9 + 7a) = 0
51 + (9 * -1 + 7a * -1) = 0
51 + (-9 + -7a) = 0

Combine like terms: 51 + -9 = 42
42 + -7a = 0

Solving
42 + -7a = 0

Solving for variable 'a'.

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

Add '-42' to each side of the equation.
42 + -42 + -7a = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -7a = 0 + -42
-7a = 0 + -42

Combine like terms: 0 + -42 = -42
-7a = -42

Divide each side by '-7'.
a = 6

Simplifying
a = 6