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Simplifying 20a + -2 = 8 + 21a Reorder the terms: -2 + 20a = 8 + 21a Solving -2 + 20a = 8 + 21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. -2 + 20a + -21a = 8 + 21a + -21a Combine like terms: 20a + -21a = -1a -2 + -1a = 8 + 21a + -21a Combine like terms: 21a + -21a = 0 -2 + -1a = 8 + 0 -2 + -1a = 8 Add '2' to each side of the equation. -2 + 2 + -1a = 8 + 2 Combine like terms: -2 + 2 = 0 0 + -1a = 8 + 2 -1a = 8 + 2 Combine like terms: 8 + 2 = 10 -1a = 10 Divide each side by '-1'. a = -10 Simplifying a = -10
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