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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 = -13 (-3a) = -13 Divide each side by '-3'. a = 4.333333333 Simplifying a = 4.333333333
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