2x+3+y=21

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Solution for 2x+3+y=21 equation:


Simplifying
2x + 3 + y = 21

Reorder the terms:
3 + 2x + y = 21

Solving
3 + 2x + y = 21

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + 2x + -3 + y = 21 + -3

Reorder the terms:
3 + -3 + 2x + y = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 2x + y = 21 + -3
2x + y = 21 + -3

Combine like terms: 21 + -3 = 18
2x + y = 18

Add '-1y' to each side of the equation.
2x + y + -1y = 18 + -1y

Combine like terms: y + -1y = 0
2x + 0 = 18 + -1y
2x = 18 + -1y

Divide each side by '2'.
x = 9 + -0.5y

Simplifying
x = 9 + -0.5y

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