-a-(-3)=10

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Solution for -a-(-3)=10 equation: 


Simplifying
-1a + -1(-3) = 10

Multiply -1 * -3
-1a + 3 = 10

Reorder the terms:
3 + -1a = 10

Solving
3 + -1a = 10

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + -1a = 10 + -3

Combine like terms: 3 + -3 = 0
0 + -1a = 10 + -3
-1a = 10 + -3

Combine like terms: 10 + -3 = 7
-1a = 7

Divide each side by '-1'.
a = -7

Simplifying
a = -7

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