6x+3x=45

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Solution for 6x+3x=45 equation: 


Simplifying
6x + 3x = 45

Combine like terms: 6x + 3x = 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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