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Simplifying 7 = 15 + -2(-3 + y) 7 = 15 + (-3 * -2 + y * -2) 7 = 15 + (6 + -2y) Combine like terms: 15 + 6 = 21 7 = 21 + -2y Solving 7 = 21 + -2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2y' to each side of the equation. 7 + 2y = 21 + -2y + 2y Combine like terms: -2y + 2y = 0 7 + 2y = 21 + 0 7 + 2y = 21 Add '-7' to each side of the equation. 7 + -7 + 2y = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 2y = 21 + -7 2y = 21 + -7 Combine like terms: 21 + -7 = 14 2y = 14 Divide each side by '2'. y = 7 Simplifying y = 7
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