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Simplifying a + 2a + -1 + -3 = a Reorder the terms: -1 + -3 + a + 2a = a Combine like terms: -1 + -3 = -4 -4 + a + 2a = a Combine like terms: a + 2a = 3a -4 + 3a = a Solving -4 + 3a = 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 + 3a + -1a = a + -1a Combine like terms: 3a + -1a = 2a -4 + 2a = a + -1a Combine like terms: a + -1a = 0 -4 + 2a = 0 Add '4' to each side of the equation. -4 + 4 + 2a = 0 + 4 Combine like terms: -4 + 4 = 0 0 + 2a = 0 + 4 2a = 0 + 4 Combine like terms: 0 + 4 = 4 2a = 4 Divide each side by '2'. a = 2 Simplifying a = 2
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