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Simplifying -1(a + (a)) = 2a -1(a + a) = 2a Combine like terms: a + a = 2a -1(2a) = 2a Remove parenthesis around (2a) -1 * 2a = 2a Multiply -1 * 2 -2a = 2a Solving -2a = 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. -2a + -2a = 2a + -2a Combine like terms: -2a + -2a = -4a -4a = 2a + -2a Combine like terms: 2a + -2a = 0 -4a = 0 Divide each side by '-4'. a = 0 Simplifying a = 0
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