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Simplifying -20 = 5(2a + -4) + -3a Reorder the terms: -20 = 5(-4 + 2a) + -3a -20 = (-4 * 5 + 2a * 5) + -3a -20 = (-20 + 10a) + -3a Combine like terms: 10a + -3a = 7a -20 = -20 + 7a Add '20' to each side of the equation. -20 + 20 = -20 + 20 + 7a Combine like terms: -20 + 20 = 0 0 = -20 + 20 + 7a Combine like terms: -20 + 20 = 0 0 = 0 + 7a 0 = 7a Solving 0 = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. 0 + -7a = 7a + -7a Remove the zero: -7a = 7a + -7a Combine like terms: 7a + -7a = 0 -7a = 0 Divide each side by '-7'. a = 0 Simplifying a = 0
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