x*2+4*x+y*2-21=0

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Solution for x*2+4*x+y*2-21=0 equation:


Simplifying
x * 2 + 4x + y * 2 + -21 = 0

Reorder the terms for easier multiplication:
2x + 4x + y * 2 + -21 = 0

Reorder the terms for easier multiplication:
2x + 4x + 2y + -21 = 0

Reorder the terms:
-21 + 2x + 4x + 2y = 0

Combine like terms: 2x + 4x = 6x
-21 + 6x + 2y = 0

Solving
-21 + 6x + 2y = 0

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 + 6x + 21 + 2y = 0 + 21

Reorder the terms:
-21 + 21 + 6x + 2y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 6x + 2y = 0 + 21
6x + 2y = 0 + 21

Combine like terms: 0 + 21 = 21
6x + 2y = 21

Add '-2y' to each side of the equation.
6x + 2y + -2y = 21 + -2y

Combine like terms: 2y + -2y = 0
6x + 0 = 21 + -2y
6x = 21 + -2y

Divide each side by '6'.
x = 3.5 + -0.3333333333y

Simplifying
x = 3.5 + -0.3333333333y

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