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Simplifying 3a + -9 = 20a + 9 Reorder the terms: -9 + 3a = 20a + 9 Reorder the terms: -9 + 3a = 9 + 20a Solving -9 + 3a = 9 + 20a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20a' to each side of the equation. -9 + 3a + -20a = 9 + 20a + -20a Combine like terms: 3a + -20a = -17a -9 + -17a = 9 + 20a + -20a Combine like terms: 20a + -20a = 0 -9 + -17a = 9 + 0 -9 + -17a = 9 Add '9' to each side of the equation. -9 + 9 + -17a = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -17a = 9 + 9 -17a = 9 + 9 Combine like terms: 9 + 9 = 18 -17a = 18 Divide each side by '-17'. a = -1.058823529 Simplifying a = -1.058823529
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