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Simplifying 21 + 7(12 + y) + -2 = 100 21 + (12 * 7 + y * 7) + -2 = 100 21 + (84 + 7y) + -2 = 100 Reorder the terms: 21 + 84 + -2 + 7y = 100 Combine like terms: 21 + 84 = 105 105 + -2 + 7y = 100 Combine like terms: 105 + -2 = 103 103 + 7y = 100 Solving 103 + 7y = 100 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-103' to each side of the equation. 103 + -103 + 7y = 100 + -103 Combine like terms: 103 + -103 = 0 0 + 7y = 100 + -103 7y = 100 + -103 Combine like terms: 100 + -103 = -3 7y = -3 Divide each side by '7'. y = -0.4285714286 Simplifying y = -0.4285714286
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