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Simplifying y + -7 + 2(y + -1) = 12 Reorder the terms: y + -7 + 2(-1 + y) = 12 y + -7 + (-1 * 2 + y * 2) = 12 y + -7 + (-2 + 2y) = 12 Reorder the terms: -7 + -2 + y + 2y = 12 Combine like terms: -7 + -2 = -9 -9 + y + 2y = 12 Combine like terms: y + 2y = 3y -9 + 3y = 12 Solving -9 + 3y = 12 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3y = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 3y = 12 + 9 3y = 12 + 9 Combine like terms: 12 + 9 = 21 3y = 21 Divide each side by '3'. y = 7 Simplifying y = 7
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