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Simplifying 2a + -2 = -2(a + -9) Reorder the terms: -2 + 2a = -2(a + -9) Reorder the terms: -2 + 2a = -2(-9 + a) -2 + 2a = (-9 * -2 + a * -2) -2 + 2a = (18 + -2a) Solving -2 + 2a = 18 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -2 + 2a + 2a = 18 + -2a + 2a Combine like terms: 2a + 2a = 4a -2 + 4a = 18 + -2a + 2a Combine like terms: -2a + 2a = 0 -2 + 4a = 18 + 0 -2 + 4a = 18 Add '2' to each side of the equation. -2 + 2 + 4a = 18 + 2 Combine like terms: -2 + 2 = 0 0 + 4a = 18 + 2 4a = 18 + 2 Combine like terms: 18 + 2 = 20 4a = 20 Divide each side by '4'. a = 5 Simplifying a = 5
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