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Simplifying 20.5 = -7.5a + 6.5a Combine like terms: -7.5a + 6.5a = -1a 20.5 = -1a Solving 20.5 = -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 20.5 + a = -1a + a Combine like terms: -1a + a = 0 20.5 + a = 0 Add '-20.5' to each side of the equation. 20.5 + -20.5 + a = 0 + -20.5 Combine like terms: 20.5 + -20.5 = 0.0 0.0 + a = 0 + -20.5 a = 0 + -20.5 Combine like terms: 0 + -20.5 = -20.5 a = -20.5 Simplifying a = -20.5
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