-1a+(-3a)+15+5a-(-2)=

Solution for -1a+(-3a)+15+5a-(-2)= equation:

Simplifying
-1a + (-3a) + 15 + 5a + -1(-2) = 0

Multiply -1 * -2
-1a + (-3a) + 15 + 5a + 2 = 0

Reorder the terms:
15 + 2 + -1a + (-3a) + 5a = 0

Combine like terms: 15 + 2 = 17
17 + -1a + (-3a) + 5a = 0

Combine like terms: -1a + (-3a) = -4a
17 + -4a + 5a = 0

Combine like terms: -4a + 5a = 1a
17 + 1a = 0

Solving
17 + 1a = 0

Solving for variable 'a'.

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

Add '-17' to each side of the equation.
17 + -17 + 1a = 0 + -17

Combine like terms: 17 + -17 = 0
0 + 1a = 0 + -17
1a = 0 + -17

Combine like terms: 0 + -17 = -17
1a = -17

Divide each side by '1'.
a = -17

Simplifying
a = -17