3a=(a-b)+c

Solution for 3a=(a-b)+c equation:

Simplifying
3a = (a + -1b) + c

Remove parenthesis around (a + -1b)
3a = a + -1b + c

Solving
3a = a + -1b + c

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.
3a + -1a = a + -1b + -1a + c

Combine like terms: 3a + -1a = 2a
2a = a + -1b + -1a + c

Reorder the terms:
2a = a + -1a + -1b + c

Combine like terms: a + -1a = 0
2a = 0 + -1b + c
2a = -1b + c

Divide each side by '2'.
a = -0.5b + 0.5c

Simplifying
a = -0.5b + 0.5c