-21x=3(7-7y)

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Solution for -21x=3(7-7y) equation: 


Simplifying
-21x = 3(7 + -7y)
-21x = (7 * 3 + -7y * 3)
-21x = (21 + -21y)

Solving
-21x = 21 + -21y

Solving for variable 'x'.

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

Divide each side by '-21'.
x = -1 + y

Simplifying
x = -1 + y

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