42=5a-3

Solution for 42=5a-3 equation:

Simplifying
42 = 5a + -3

Reorder the terms:
42 = -3 + 5a

Solving
42 = -3 + 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
42 + -5a = -3 + 5a + -5a

Combine like terms: 5a + -5a = 0
42 + -5a = -3 + 0
42 + -5a = -3

Add '-42' to each side of the equation.
42 + -42 + -5a = -3 + -42

Combine like terms: 42 + -42 = 0
0 + -5a = -3 + -42
-5a = -3 + -42

Combine like terms: -3 + -42 = -45
-5a = -45

Divide each side by '-5'.
a = 9

Simplifying
a = 9