7x+y-21=-2y

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Solution for 7x+y-21=-2y equation:


Simplifying
7x + y + -21 = -2y

Reorder the terms:
-21 + 7x + y = -2y

Solving
-21 + 7x + y = -2y

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 7x + 21 + y = 21 + -2y

Reorder the terms:
-21 + 21 + 7x + y = 21 + -2y

Combine like terms: -21 + 21 = 0
0 + 7x + y = 21 + -2y
7x + y = 21 + -2y

Add '-1y' to each side of the equation.
7x + y + -1y = 21 + -2y + -1y

Combine like terms: y + -1y = 0
7x + 0 = 21 + -2y + -1y
7x = 21 + -2y + -1y

Combine like terms: -2y + -1y = -3y
7x = 21 + -3y

Divide each side by '7'.
x = 3 + -0.4285714286y

Simplifying
x = 3 + -0.4285714286y

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