2X+Y-21=0

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Solution for 2X+Y-21=0 equation: 


Simplifying
2X + Y + -21 = 0

Reorder the terms:
-21 + 2X + Y = 0

Solving
-21 + 2X + Y = 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 + 2X + 21 + Y = 0 + 21

Reorder the terms:
-21 + 21 + 2X + Y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 2X + Y = 0 + 21
2X + Y = 0 + 21

Combine like terms: 0 + 21 = 21
2X + Y = 21

Add '-1Y' to each side of the equation.
2X + Y + -1Y = 21 + -1Y

Combine like terms: Y + -1Y = 0
2X + 0 = 21 + -1Y
2X = 21 + -1Y

Divide each side by '2'.
X = 10.5 + -0.5Y

Simplifying
X = 10.5 + -0.5Y

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