a+42=15a

Solution for a+42=15a equation:

Simplifying
a + 42 = 15a

Reorder the terms:
42 + a = 15a

Solving
42 + a = 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.
42 + a + -15a = 15a + -15a

Combine like terms: a + -15a = -14a
42 + -14a = 15a + -15a

Combine like terms: 15a + -15a = 0
42 + -14a = 0

Add '-42' to each side of the equation.
42 + -42 + -14a = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -14a = 0 + -42
-14a = 0 + -42

Combine like terms: 0 + -42 = -42
-14a = -42

Divide each side by '-14'.
a = 3

Simplifying
a = 3