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Simplifying -2(a + 7) + -1 = 0 Reorder the terms: -2(7 + a) + -1 = 0 (7 * -2 + a * -2) + -1 = 0 (-14 + -2a) + -1 = 0 Reorder the terms: -14 + -1 + -2a = 0 Combine like terms: -14 + -1 = -15 -15 + -2a = 0 Solving -15 + -2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -2a = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -2a = 0 + 15 -2a = 0 + 15 Combine like terms: 0 + 15 = 15 -2a = 15 Divide each side by '-2'. a = -7.5 Simplifying a = -7.5
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