3x=21-y

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Solution for 3x=21-y equation: 


Simplifying
3x = 21 + -1y

Solving
3x = 21 + -1y

Solving for variable 'x'.

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

Divide each side by '3'.
x = 7 + -0.3333333333y

Simplifying
x = 7 + -0.3333333333y

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