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Simplifying 4 = -9 + a Solving 4 = -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. 4 + -1a = -9 + a + -1a Combine like terms: a + -1a = 0 4 + -1a = -9 + 0 4 + -1a = -9 Add '-4' to each side of the equation. 4 + -4 + -1a = -9 + -4 Combine like terms: 4 + -4 = 0 0 + -1a = -9 + -4 -1a = -9 + -4 Combine like terms: -9 + -4 = -13 -1a = -13 Divide each side by '-1'. a = 13 Simplifying a = 13
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