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Simplifying a + 3(x + 4) = 20 Reorder the terms: a + 3(4 + x) = 20 a + (4 * 3 + x * 3) = 20 a + (12 + 3x) = 20 Reorder the terms: 12 + a + 3x = 20 Solving 12 + a + 3x = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + a + -12 + 3x = 20 + -12 Reorder the terms: 12 + -12 + a + 3x = 20 + -12 Combine like terms: 12 + -12 = 0 0 + a + 3x = 20 + -12 a + 3x = 20 + -12 Combine like terms: 20 + -12 = 8 a + 3x = 8 Add '-3x' to each side of the equation. a + 3x + -3x = 8 + -3x Combine like terms: 3x + -3x = 0 a + 0 = 8 + -3x a = 8 + -3x Simplifying a = 8 + -3x
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