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Simplifying a + 9 = 4a + -18 Reorder the terms: 9 + a = 4a + -18 Reorder the terms: 9 + a = -18 + 4a Solving 9 + a = -18 + 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. 9 + a + -4a = -18 + 4a + -4a Combine like terms: a + -4a = -3a 9 + -3a = -18 + 4a + -4a Combine like terms: 4a + -4a = 0 9 + -3a = -18 + 0 9 + -3a = -18 Add '-9' to each side of the equation. 9 + -9 + -3a = -18 + -9 Combine like terms: 9 + -9 = 0 0 + -3a = -18 + -9 -3a = -18 + -9 Combine like terms: -18 + -9 = -27 -3a = -27 Divide each side by '-3'. a = 9 Simplifying a = 9
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