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Simplifying (3a + -6a) + 7 = -20 Combine like terms: 3a + -6a = -3a (-3a) + 7 = -20 (-3a) + 7 = -20 Reorder the terms: 7 + (-3a) = -20 Solving 7 + (-3a) = -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 + (-3a) = -20 + -7 Combine like terms: 7 + -7 = 0 0 + (-3a) = -20 + -7 (-3a) = -20 + -7 Combine like terms: -20 + -7 = -27 (-3a) = -27 Divide each side by '-3'. a = 9 Simplifying a = 9
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