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Simplifying a + -1(3a + 2) = 18a Reorder the terms: a + -1(2 + 3a) = 18a a + (2 * -1 + 3a * -1) = 18a a + (-2 + -3a) = 18a Reorder the terms: -2 + a + -3a = 18a Combine like terms: a + -3a = -2a -2 + -2a = 18a Solving -2 + -2a = 18a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18a' to each side of the equation. -2 + -2a + -18a = 18a + -18a Combine like terms: -2a + -18a = -20a -2 + -20a = 18a + -18a Combine like terms: 18a + -18a = 0 -2 + -20a = 0 Add '2' to each side of the equation. -2 + 2 + -20a = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -20a = 0 + 2 -20a = 0 + 2 Combine like terms: 0 + 2 = 2 -20a = 2 Divide each side by '-20'. a = -0.1 Simplifying a = -0.1
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