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Simplifying 21 + 7(12 + y) * 2 = 100 Reorder the terms for easier multiplication: 21 + 7 * 2(12 + y) = 100 Multiply 7 * 2 21 + 14(12 + y) = 100 21 + (12 * 14 + y * 14) = 100 21 + (168 + 14y) = 100 Combine like terms: 21 + 168 = 189 189 + 14y = 100 Solving 189 + 14y = 100 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-189' to each side of the equation. 189 + -189 + 14y = 100 + -189 Combine like terms: 189 + -189 = 0 0 + 14y = 100 + -189 14y = 100 + -189 Combine like terms: 100 + -189 = -89 14y = -89 Divide each side by '14'. y = -6.357142857 Simplifying y = -6.357142857
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