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Simplifying (2 + -5)(7 + a) + 15 = 3 Combine like terms: 2 + -5 = -3 (-3)(7 + a) + 15 = 3 (7 * -3 + a * -3) + 15 = 3 (-21 + -3a) + 15 = 3 Reorder the terms: -21 + 15 + -3a = 3 Combine like terms: -21 + 15 = -6 -6 + -3a = 3 Solving -6 + -3a = 3 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 + -3a = 3 + 6 Combine like terms: -6 + 6 = 0 0 + -3a = 3 + 6 -3a = 3 + 6 Combine like terms: 3 + 6 = 9 -3a = 9 Divide each side by '-3'. a = -3 Simplifying a = -3
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