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Simplifying -1(a + -2) + -6a + -2 = 21 Reorder the terms: -1(-2 + a) + -6a + -2 = 21 (-2 * -1 + a * -1) + -6a + -2 = 21 (2 + -1a) + -6a + -2 = 21 Reorder the terms: 2 + -2 + -1a + -6a = 21 Combine like terms: 2 + -2 = 0 0 + -1a + -6a = 21 -1a + -6a = 21 Combine like terms: -1a + -6a = -7a -7a = 21 Solving -7a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '-7'. a = -3 Simplifying a = -3
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