3(x+y)=21

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Solution for 3(x+y)=21 equation: 


Simplifying
3(x + y) = 21
(x * 3 + y * 3) = 21
(3x + 3y) = 21

Solving
3x + 3y = 21

Solving for variable 'x'.

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

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

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

Divide each side by '3'.
x = 7 + -1y

Simplifying
x = 7 + -1y

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