86=a-(-51)

Solution for 86=a-(-51) equation:

Simplifying
86 = a + -1(-51)

Multiply -1 * -51
86 = a + 51

Reorder the terms:
86 = 51 + a

Solving
86 = 51 + 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.
86 + -1a = 51 + a + -1a

Combine like terms: a + -1a = 0
86 + -1a = 51 + 0
86 + -1a = 51

Add '-86' to each side of the equation.
86 + -86 + -1a = 51 + -86

Combine like terms: 86 + -86 = 0
0 + -1a = 51 + -86
-1a = 51 + -86

Combine like terms: 51 + -86 = -35
-1a = -35

Divide each side by '-1'.
a = 35

Simplifying
a = 35