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Simplifying -20.5 = 8.5a + 2a Combine like terms: 8.5a + 2a = 10.5a -20.5 = 10.5a Solving -20.5 = 10.5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10.5a' to each side of the equation. -20.5 + -10.5a = 10.5a + -10.5a Combine like terms: 10.5a + -10.5a = 0.0 -20.5 + -10.5a = 0.0 Add '20.5' to each side of the equation. -20.5 + 20.5 + -10.5a = 0.0 + 20.5 Combine like terms: -20.5 + 20.5 = 0.0 0.0 + -10.5a = 0.0 + 20.5 -10.5a = 0.0 + 20.5 Combine like terms: 0.0 + 20.5 = 20.5 -10.5a = 20.5 Divide each side by '-10.5'. a = -1.952380952 Simplifying a = -1.952380952
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