7x-(3y)=21

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Solution for 7x-(3y)=21 equation: 


Simplifying
7x + -1(3y) = 21

Remove parenthesis around (3y)
7x + -1 * 3y = 21

Multiply -1 * 3
7x + -3y = 21

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

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

Divide each side by '7'.
x = 3 + 0.4285714286y

Simplifying
x = 3 + 0.4285714286y

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