5a+42=-4a+123

Solution for 5a+42=-4a+123 equation:

Simplifying
5a + 42 = -4a + 123

Reorder the terms:
42 + 5a = -4a + 123

Reorder the terms:
42 + 5a = 123 + -4a

Solving
42 + 5a = 123 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
42 + 5a + 4a = 123 + -4a + 4a

Combine like terms: 5a + 4a = 9a
42 + 9a = 123 + -4a + 4a

Combine like terms: -4a + 4a = 0
42 + 9a = 123 + 0
42 + 9a = 123

Add '-42' to each side of the equation.
42 + -42 + 9a = 123 + -42

Combine like terms: 42 + -42 = 0
0 + 9a = 123 + -42
9a = 123 + -42

Combine like terms: 123 + -42 = 81
9a = 81

Divide each side by '9'.
a = 9

Simplifying
a = 9