9+3x=21+3

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Solution for 9+3x=21+3 equation: 


Simplifying
9 + 3x = 21 + 3

Combine like terms: 21 + 3 = 24
9 + 3x = 24

Solving
9 + 3x = 24

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 24 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 24 + -9
3x = 24 + -9

Combine like terms: 24 + -9 = 15
3x = 15

Divide each side by '3'.
x = 5

Simplifying
x = 5

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