9+3=3x

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Solution for 9+3=3x equation:


Simplifying
9 + 3 = 3x

Combine like terms: 9 + 3 = 12
12 = 3x

Solving
12 = 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
12 + -3x = 3x + -3x

Combine like terms: 3x + -3x = 0
12 + -3x = 0

Add '-12' to each side of the equation.
12 + -12 + -3x = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -3x = 0 + -12
-3x = 0 + -12

Combine like terms: 0 + -12 = -12
-3x = -12

Divide each side by '-3'.
x = 4

Simplifying
x = 4

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