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Simplifying -6a + -15 = -3a + -21 Reorder the terms: -15 + -6a = -3a + -21 Reorder the terms: -15 + -6a = -21 + -3a Solving -15 + -6a = -21 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -15 + -6a + 3a = -21 + -3a + 3a Combine like terms: -6a + 3a = -3a -15 + -3a = -21 + -3a + 3a Combine like terms: -3a + 3a = 0 -15 + -3a = -21 + 0 -15 + -3a = -21 Add '15' to each side of the equation. -15 + 15 + -3a = -21 + 15 Combine like terms: -15 + 15 = 0 0 + -3a = -21 + 15 -3a = -21 + 15 Combine like terms: -21 + 15 = -6 -3a = -6 Divide each side by '-3'. a = 2 Simplifying a = 2
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