x+3x+5x=45

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Solution for x+3x+5x=45 equation: 


Simplifying
x + 3x + 5x = 45

Combine like terms: x + 3x = 4x
4x + 5x = 45

Combine like terms: 4x + 5x = 9x
9x = 45

Solving
9x = 45

Solving for variable 'x'.

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

Divide each side by '9'.
x = 5

Simplifying
x = 5

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