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Simplifying 6a + -9 = 3a + -21 Reorder the terms: -9 + 6a = 3a + -21 Reorder the terms: -9 + 6a = -21 + 3a Solving -9 + 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. -9 + 6a + -3a = -21 + 3a + -3a Combine like terms: 6a + -3a = 3a -9 + 3a = -21 + 3a + -3a Combine like terms: 3a + -3a = 0 -9 + 3a = -21 + 0 -9 + 3a = -21 Add '9' to each side of the equation. -9 + 9 + 3a = -21 + 9 Combine like terms: -9 + 9 = 0 0 + 3a = -21 + 9 3a = -21 + 9 Combine like terms: -21 + 9 = -12 3a = -12 Divide each side by '3'. a = -4 Simplifying a = -4
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