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Simplifying 2a + 3(a + 7) = a + 3 Reorder the terms: 2a + 3(7 + a) = a + 3 2a + (7 * 3 + a * 3) = a + 3 2a + (21 + 3a) = a + 3 Reorder the terms: 21 + 2a + 3a = a + 3 Combine like terms: 2a + 3a = 5a 21 + 5a = a + 3 Reorder the terms: 21 + 5a = 3 + a Solving 21 + 5a = 3 + 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. 21 + 5a + -1a = 3 + a + -1a Combine like terms: 5a + -1a = 4a 21 + 4a = 3 + a + -1a Combine like terms: a + -1a = 0 21 + 4a = 3 + 0 21 + 4a = 3 Add '-21' to each side of the equation. 21 + -21 + 4a = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 4a = 3 + -21 4a = 3 + -21 Combine like terms: 3 + -21 = -18 4a = -18 Divide each side by '4'. a = -4.5 Simplifying a = -4.5
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