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Simplifying a + -1(7 + 2a) = 2 a + (7 * -1 + 2a * -1) = 2 a + (-7 + -2a) = 2 Reorder the terms: -7 + a + -2a = 2 Combine like terms: a + -2a = -1a -7 + -1a = 2 Solving -7 + -1a = 2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1a = 2 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = 2 + 7 -1a = 2 + 7 Combine like terms: 2 + 7 = 9 -1a = 9 Divide each side by '-1'. a = -9 Simplifying a = -9
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