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Simplifying -30 + 21 = a Combine like terms: -30 + 21 = -9 -9 = a Solving -9 = a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -9 + -1a = a + -1a Combine like terms: a + -1a = 0 -9 + -1a = 0 Add '9' to each side of the equation. -9 + 9 + -1a = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1a = 0 + 9 -1a = 0 + 9 Combine like terms: 0 + 9 = 9 -1a = 9 Divide each side by '-1'. a = -9 Simplifying a = -9
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