3x-7y+21=0

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Solution for 3x-7y+21=0 equation:


Simplifying
3x + -7y + 21 = 0

Reorder the terms:
21 + 3x + -7y = 0

Solving
21 + 3x + -7y = 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 + 3x + -21 + -7y = 0 + -21

Reorder the terms:
21 + -21 + 3x + -7y = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 3x + -7y = 0 + -21
3x + -7y = 0 + -21

Combine like terms: 0 + -21 = -21
3x + -7y = -21

Add '7y' to each side of the equation.
3x + -7y + 7y = -21 + 7y

Combine like terms: -7y + 7y = 0
3x + 0 = -21 + 7y
3x = -21 + 7y

Divide each side by '3'.
x = -7 + 2.333333333y

Simplifying
x = -7 + 2.333333333y

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