3x=15+3

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Solution for 3x=15+3 equation: 


Simplifying
3x = 15 + 3

Combine like terms: 15 + 3 = 18
3x = 18

Solving
3x = 18

Solving for variable 'x'.

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

Divide each side by '3'.
x = 6

Simplifying
x = 6

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