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Simplifying 9y + -1 = 7(y + -3) Reorder the terms: -1 + 9y = 7(y + -3) Reorder the terms: -1 + 9y = 7(-3 + y) -1 + 9y = (-3 * 7 + y * 7) -1 + 9y = (-21 + 7y) Solving -1 + 9y = -21 + 7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7y' to each side of the equation. -1 + 9y + -7y = -21 + 7y + -7y Combine like terms: 9y + -7y = 2y -1 + 2y = -21 + 7y + -7y Combine like terms: 7y + -7y = 0 -1 + 2y = -21 + 0 -1 + 2y = -21 Add '1' to each side of the equation. -1 + 1 + 2y = -21 + 1 Combine like terms: -1 + 1 = 0 0 + 2y = -21 + 1 2y = -21 + 1 Combine like terms: -21 + 1 = -20 2y = -20 Divide each side by '2'. y = -10 Simplifying y = -10
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