3x+9y-4=15

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Solution for 3x+9y-4=15 equation:


Simplifying
3x + 9y + -4 = 15

Reorder the terms:
-4 + 3x + 9y = 15

Solving
-4 + 3x + 9y = 15

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 3x + 4 + 9y = 15 + 4

Reorder the terms:
-4 + 4 + 3x + 9y = 15 + 4

Combine like terms: -4 + 4 = 0
0 + 3x + 9y = 15 + 4
3x + 9y = 15 + 4

Combine like terms: 15 + 4 = 19
3x + 9y = 19

Add '-9y' to each side of the equation.
3x + 9y + -9y = 19 + -9y

Combine like terms: 9y + -9y = 0
3x + 0 = 19 + -9y
3x = 19 + -9y

Divide each side by '3'.
x = 6.333333333 + -3y

Simplifying
x = 6.333333333 + -3y

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