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Simplifying 3a + -2a + -7 = 13 Reorder the terms: -7 + 3a + -2a = 13 Combine like terms: 3a + -2a = 1a -7 + 1a = 13 Solving -7 + 1a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 1a = 13 + 7 Combine like terms: -7 + 7 = 0 0 + 1a = 13 + 7 1a = 13 + 7 Combine like terms: 13 + 7 = 20 1a = 20 Divide each side by '1'. a = 20 Simplifying a = 20
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