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Simplifying a + -1(7 + 2a) = 20 a + (7 * -1 + 2a * -1) = 20 a + (-7 + -2a) = 20 Reorder the terms: -7 + a + -2a = 20 Combine like terms: a + -2a = -1a -7 + -1a = 20 Solving -7 + -1a = 20 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 = 20 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = 20 + 7 -1a = 20 + 7 Combine like terms: 20 + 7 = 27 -1a = 27 Divide each side by '-1'. a = -27 Simplifying a = -27
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