21x+y=9x+9y

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Solution for 21x+y=9x+9y equation: 


Simplifying
21x + y = 9x + 9y

Solving
21x + y = 9x + 9y

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
21x + -9x + y = 9x + -9x + 9y

Combine like terms: 21x + -9x = 12x
12x + y = 9x + -9x + 9y

Combine like terms: 9x + -9x = 0
12x + y = 0 + 9y
12x + y = 9y

Add '-1y' to each side of the equation.
12x + y + -1y = 9y + -1y

Combine like terms: y + -1y = 0
12x + 0 = 9y + -1y
12x = 9y + -1y

Combine like terms: 9y + -1y = 8y
12x = 8y

Divide each side by '12'.
x = 0.6666666667y

Simplifying
x = 0.6666666667y

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