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Simplifying -3a + 4(a + -2) = 13 Reorder the terms: -3a + 4(-2 + a) = 13 -3a + (-2 * 4 + a * 4) = 13 -3a + (-8 + 4a) = 13 Reorder the terms: -8 + -3a + 4a = 13 Combine like terms: -3a + 4a = 1a -8 + 1a = 13 Solving -8 + 1a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 1a = 13 + 8 Combine like terms: -8 + 8 = 0 0 + 1a = 13 + 8 1a = 13 + 8 Combine like terms: 13 + 8 = 21 1a = 21 Divide each side by '1'. a = 21 Simplifying a = 21
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