2x+8y=21

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Solution for 2x+8y=21 equation: 


Simplifying
2x + 8y = 21

Solving
2x + 8y = 21

Solving for variable 'x'.

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

Add '-8y' to each side of the equation.
2x + 8y + -8y = 21 + -8y

Combine like terms: 8y + -8y = 0
2x + 0 = 21 + -8y
2x = 21 + -8y

Divide each side by '2'.
x = 10.5 + -4y

Simplifying
x = 10.5 + -4y

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