21+9x=y-3x

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Solution for 21+9x=y-3x equation:


Simplifying
21 + 9x = y + -3x

Reorder the terms:
21 + 9x = -3x + y

Solving
21 + 9x = -3x + y

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
21 + 9x + 3x = -3x + 3x + y

Combine like terms: 9x + 3x = 12x
21 + 12x = -3x + 3x + y

Combine like terms: -3x + 3x = 0
21 + 12x = 0 + y
21 + 12x = y

Add '-21' to each side of the equation.
21 + -21 + 12x = -21 + y

Combine like terms: 21 + -21 = 0
0 + 12x = -21 + y
12x = -21 + y

Divide each side by '12'.
x = -1.75 + 0.08333333333y

Simplifying
x = -1.75 + 0.08333333333y

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