9+x+3x=45

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Solution for 9+x+3x=45 equation: 


Simplifying
9 + x + 3x = 45

Combine like terms: x + 3x = 4x
9 + 4x = 45

Solving
9 + 4x = 45

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 4x = 45 + -9

Combine like terms: 9 + -9 = 0
0 + 4x = 45 + -9
4x = 45 + -9

Combine like terms: 45 + -9 = 36
4x = 36

Divide each side by '4'.
x = 9

Simplifying
x = 9

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