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Simplifying 2a + 4 = -18 + -9a Reorder the terms: 4 + 2a = -18 + -9a Solving 4 + 2a = -18 + -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. 4 + 2a + 9a = -18 + -9a + 9a Combine like terms: 2a + 9a = 11a 4 + 11a = -18 + -9a + 9a Combine like terms: -9a + 9a = 0 4 + 11a = -18 + 0 4 + 11a = -18 Add '-4' to each side of the equation. 4 + -4 + 11a = -18 + -4 Combine like terms: 4 + -4 = 0 0 + 11a = -18 + -4 11a = -18 + -4 Combine like terms: -18 + -4 = -22 11a = -22 Divide each side by '11'. a = -2 Simplifying a = -2
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