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Simplifying (-7a) + -1(-1a) + -1(-8a) = (-20a) Remove parenthesis around (-1a) (-7a) + -1 * -1a + -1(-8a) = (-20a) Multiply -1 * -1 (-7a) + 1a + -1(-8a) = (-20a) Remove parenthesis around (-8a) (-7a) + 1a + -1 * -8a = (-20a) Multiply -1 * -8 (-7a) + 1a + 8a = (-20a) Combine like terms: (-7a) + 1a = -6a -6a + 8a = (-20a) Combine like terms: -6a + 8a = 2a 2a = (-20a) Solving 2a = (-20a) Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '(20a)' to each side of the equation. 2a + (20a) = (-20a) + (20a) Combine like terms: 2a + (20a) = 22a 22a = (-20a) + (20a) Combine like terms: (-20a) + (20a) = 0 22a = 0 Divide each side by '22'. a = 0 Simplifying a = 0
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