42=18-8a

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Solution for 42=18-8a equation:


Simplifying
42 = 18 + -8a

Solving
42 = 18 + -8a

Solving for variable 'a'.

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

Add '8a' to each side of the equation.
42 + 8a = 18 + -8a + 8a

Combine like terms: -8a + 8a = 0
42 + 8a = 18 + 0
42 + 8a = 18

Add '-42' to each side of the equation.
42 + -42 + 8a = 18 + -42

Combine like terms: 42 + -42 = 0
0 + 8a = 18 + -42
8a = 18 + -42

Combine like terms: 18 + -42 = -24
8a = -24

Divide each side by '8'.
a = -3

Simplifying
a = -3

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