3x+9y=45

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Solution for 3x+9y=45 equation: 


Simplifying
3x + 9y = 45

Solving
3x + 9y = 45

Solving for variable 'x'.

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

Add '-9y' to each side of the equation.
3x + 9y + -9y = 45 + -9y

Combine like terms: 9y + -9y = 0
3x + 0 = 45 + -9y
3x = 45 + -9y

Divide each side by '3'.
x = 15 + -3y

Simplifying
x = 15 + -3y

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