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Simplifying 20(a + 7 + 9b) = 0 Reorder the terms: 20(7 + a + 9b) = 0 (7 * 20 + a * 20 + 9b * 20) = 0 (140 + 20a + 180b) = 0 Solving 140 + 20a + 180b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-140' to each side of the equation. 140 + 20a + -140 + 180b = 0 + -140 Reorder the terms: 140 + -140 + 20a + 180b = 0 + -140 Combine like terms: 140 + -140 = 0 0 + 20a + 180b = 0 + -140 20a + 180b = 0 + -140 Combine like terms: 0 + -140 = -140 20a + 180b = -140 Add '-180b' to each side of the equation. 20a + 180b + -180b = -140 + -180b Combine like terms: 180b + -180b = 0 20a + 0 = -140 + -180b 20a = -140 + -180b Divide each side by '20'. a = -7 + -9b Simplifying a = -7 + -9b
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