21=4-(3xy)

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Solution for 21=4-(3xy) equation:


Simplifying
21 = 4 + -1(3xy)

Remove parenthesis around (3xy)
21 = 4 + -1 * 3xy

Multiply -1 * 3
21 = 4 + -3xy

Solving
21 = 4 + -3xy

Solving for variable 'x'.

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

Add '3xy' to each side of the equation.
21 + 3xy = 4 + -3xy + 3xy

Combine like terms: -3xy + 3xy = 0
21 + 3xy = 4 + 0
21 + 3xy = 4

Add '-21' to each side of the equation.
21 + -21 + 3xy = 4 + -21

Combine like terms: 21 + -21 = 0
0 + 3xy = 4 + -21
3xy = 4 + -21

Combine like terms: 4 + -21 = -17
3xy = -17

Divide each side by '3y'.
x = -5.666666667y-1

Simplifying
x = -5.666666667y-1

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