y(3x)=21

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Solution for y(3x)=21 equation: 


Simplifying
y(3x) = 21

Remove parenthesis around (3x)
y * 3x = 21

Reorder the terms for easier multiplication:
3y * x = 21

Multiply y * x
3xy = 21

Solving
3xy = 21

Solving for variable 'x'.

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

Divide each side by '3y'.
x = 7y-1

Simplifying
x = 7y-1

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