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Simplifying 30 + -2(a + 1) = 8 Reorder the terms: 30 + -2(1 + a) = 8 30 + (1 * -2 + a * -2) = 8 30 + (-2 + -2a) = 8 Combine like terms: 30 + -2 = 28 28 + -2a = 8 Solving 28 + -2a = 8 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -2a = 8 + -28 Combine like terms: 28 + -28 = 0 0 + -2a = 8 + -28 -2a = 8 + -28 Combine like terms: 8 + -28 = -20 -2a = -20 Divide each side by '-2'. a = 10 Simplifying a = 10
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