300=-15a

Solution for 300=-15a equation:

Simplifying
300 = -15a

Solving
300 = -15a

Solving for variable 'a'.

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

Add '15a' to each side of the equation.
300 + 15a = -15a + 15a

Combine like terms: -15a + 15a = 0
300 + 15a = 0

Add '-300' to each side of the equation.
300 + -300 + 15a = 0 + -300

Combine like terms: 300 + -300 = 0
0 + 15a = 0 + -300
15a = 0 + -300

Combine like terms: 0 + -300 = -300
15a = -300

Divide each side by '15'.
a = -20

Simplifying
a = -20