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Simplifying 7 + 2(2a + 2) + -17 = 15 Reorder the terms: 7 + 2(2 + 2a) + -17 = 15 7 + (2 * 2 + 2a * 2) + -17 = 15 7 + (4 + 4a) + -17 = 15 Reorder the terms: 7 + 4 + -17 + 4a = 15 Combine like terms: 7 + 4 = 11 11 + -17 + 4a = 15 Combine like terms: 11 + -17 = -6 -6 + 4a = 15 Solving -6 + 4a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 4a = 15 + 6 Combine like terms: -6 + 6 = 0 0 + 4a = 15 + 6 4a = 15 + 6 Combine like terms: 15 + 6 = 21 4a = 21 Divide each side by '4'. a = 5.25 Simplifying a = 5.25
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