5x+15x=30

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Solution for 5x+15x=30 equation: 


Simplifying
5x + 15x = 30

Combine like terms: 5x + 15x = 20x
20x = 30

Solving
20x = 30

Solving for variable 'x'.

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

Divide each side by '20'.
x = 1.5

Simplifying
x = 1.5

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