3x+15x=12

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Solution for 3x+15x=12 equation: 


Simplifying
3x + 15x = 12

Combine like terms: 3x + 15x = 18x
18x = 12

Solving
18x = 12

Solving for variable 'x'.

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

Divide each side by '18'.
x = 0.6666666667

Simplifying
x = 0.6666666667

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