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Simplifying -21 = -18 + -27a Solving -21 = -18 + -27a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '27a' to each side of the equation. -21 + 27a = -18 + -27a + 27a Combine like terms: -27a + 27a = 0 -21 + 27a = -18 + 0 -21 + 27a = -18 Add '21' to each side of the equation. -21 + 21 + 27a = -18 + 21 Combine like terms: -21 + 21 = 0 0 + 27a = -18 + 21 27a = -18 + 21 Combine like terms: -18 + 21 = 3 27a = 3 Divide each side by '27'. a = 0.1111111111 Simplifying a = 0.1111111111
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