21=7x+y

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Solution for 21=7x+y equation:


Simplifying
21 = 7x + y

Solving
21 = 7x + y

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 + y

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

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

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

Divide each side by '-7'.
x = 3 + -0.1428571429y

Simplifying
x = 3 + -0.1428571429y

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