150=a-240

Solution for 150=a-240 equation:

Simplifying
150 = a + -240

Reorder the terms:
150 = -240 + a

Solving
150 = -240 + 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.
150 + -1a = -240 + a + -1a

Combine like terms: a + -1a = 0
150 + -1a = -240 + 0
150 + -1a = -240

Add '-150' to each side of the equation.
150 + -150 + -1a = -240 + -150

Combine like terms: 150 + -150 = 0
0 + -1a = -240 + -150
-1a = -240 + -150

Combine like terms: -240 + -150 = -390
-1a = -390

Divide each side by '-1'.
a = 390

Simplifying
a = 390