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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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