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Simplifying 18a + -20 = 15a + 7 Reorder the terms: -20 + 18a = 15a + 7 Reorder the terms: -20 + 18a = 7 + 15a Solving -20 + 18a = 7 + 15a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15a' to each side of the equation. -20 + 18a + -15a = 7 + 15a + -15a Combine like terms: 18a + -15a = 3a -20 + 3a = 7 + 15a + -15a Combine like terms: 15a + -15a = 0 -20 + 3a = 7 + 0 -20 + 3a = 7 Add '20' to each side of the equation. -20 + 20 + 3a = 7 + 20 Combine like terms: -20 + 20 = 0 0 + 3a = 7 + 20 3a = 7 + 20 Combine like terms: 7 + 20 = 27 3a = 27 Divide each side by '3'. a = 9 Simplifying a = 9
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