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Simplifying -21 + -6a = 3(1 + -6a) -21 + -6a = (1 * 3 + -6a * 3) -21 + -6a = (3 + -18a) Solving -21 + -6a = 3 + -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. -21 + -6a + 18a = 3 + -18a + 18a Combine like terms: -6a + 18a = 12a -21 + 12a = 3 + -18a + 18a Combine like terms: -18a + 18a = 0 -21 + 12a = 3 + 0 -21 + 12a = 3 Add '21' to each side of the equation. -21 + 21 + 12a = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 12a = 3 + 21 12a = 3 + 21 Combine like terms: 3 + 21 = 24 12a = 24 Divide each side by '12'. a = 2 Simplifying a = 2
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