30+12=4x+9

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Solution for 30+12=4x+9 equation:


Simplifying
30 + 12 = 4x + 9

Combine like terms: 30 + 12 = 42
42 = 4x + 9

Reorder the terms:
42 = 9 + 4x

Solving
42 = 9 + 4x

Solving for variable 'x'.

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

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

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

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

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

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

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

Simplifying
x = 8.25

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