y+7x=21

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Solution for y+7x=21 equation: 


Simplifying
y + 7x = 21

Reorder the terms:
7x + y = 21

Solving
7x + y = 21

Solving for variable 'x'.

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

Add '-1y' to each side of the equation.
7x + y + -1y = 21 + -1y

Combine like terms: y + -1y = 0
7x + 0 = 21 + -1y
7x = 21 + -1y

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

Simplifying
x = 3 + -0.1428571429y

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