42=8a-2a+12

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Solution for 42=8a-2a+12 equation:


Simplifying
42 = 8a + -2a + 12

Reorder the terms:
42 = 12 + 8a + -2a

Combine like terms: 8a + -2a = 6a
42 = 12 + 6a

Solving
42 = 12 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
42 + -6a = 12 + 6a + -6a

Combine like terms: 6a + -6a = 0
42 + -6a = 12 + 0
42 + -6a = 12

Add '-42' to each side of the equation.
42 + -42 + -6a = 12 + -42

Combine like terms: 42 + -42 = 0
0 + -6a = 12 + -42
-6a = 12 + -42

Combine like terms: 12 + -42 = -30
-6a = -30

Divide each side by '-6'.
a = 5

Simplifying
a = 5

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