21=7y+7x

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Solution for 21=7y+7x equation:


Simplifying
21 = 7y + 7x

Reorder the terms:
21 = 7x + 7y

Solving
21 = 7x + 7y

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21 + -7x = 7x + -7x + 7y

Combine like terms: 7x + -7x = 0
21 + -7x = 0 + 7y
21 + -7x = 7y

Add '-21' to each side of the equation.
21 + -21 + -7x = -21 + 7y

Combine like terms: 21 + -21 = 0
0 + -7x = -21 + 7y
-7x = -21 + 7y

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

Simplifying
x = 3 + -1y

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