42=4a+9

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Solution for 42=4a+9 equation:


Simplifying
42 = 4a + 9

Reorder the terms:
42 = 9 + 4a

Solving
42 = 9 + 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 + -4a = 9 + 4a + -4a

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

Add '-42' to each side of the equation.
42 + -42 + -4a = 9 + -42

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

Combine like terms: 9 + -42 = -33
-4a = -33

Divide each side by '-4'.
a = 8.25

Simplifying
a = 8.25

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