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Simplifying -21 = 9a + -15 + -13a Reorder the terms: -21 = -15 + 9a + -13a Combine like terms: 9a + -13a = -4a -21 = -15 + -4a Solving -21 = -15 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. -21 + 4a = -15 + -4a + 4a Combine like terms: -4a + 4a = 0 -21 + 4a = -15 + 0 -21 + 4a = -15 Add '21' to each side of the equation. -21 + 21 + 4a = -15 + 21 Combine like terms: -21 + 21 = 0 0 + 4a = -15 + 21 4a = -15 + 21 Combine like terms: -15 + 21 = 6 4a = 6 Divide each side by '4'. a = 1.5 Simplifying a = 1.5
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