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Simplifying -7(-3x + -3y) = -7(3) (-3x * -7 + -3y * -7) = -7(3) (21x + 21y) = -7(3) Multiply -7 * 3 21x + 21y = -21 Solving 21x + 21y = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21y' to each side of the equation. 21x + 21y + -21y = -21 + -21y Combine like terms: 21y + -21y = 0 21x + 0 = -21 + -21y 21x = -21 + -21y Divide each side by '21'. x = -1 + -1y Simplifying x = -1 + -1y
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