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Simplifying -20 + -8a = 5a + -4(-2 + 5a) -20 + -8a = 5a + (-2 * -4 + 5a * -4) -20 + -8a = 5a + (8 + -20a) Reorder the terms: -20 + -8a = 8 + 5a + -20a Combine like terms: 5a + -20a = -15a -20 + -8a = 8 + -15a Solving -20 + -8a = 8 + -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 + -8a + 15a = 8 + -15a + 15a Combine like terms: -8a + 15a = 7a -20 + 7a = 8 + -15a + 15a Combine like terms: -15a + 15a = 0 -20 + 7a = 8 + 0 -20 + 7a = 8 Add '20' to each side of the equation. -20 + 20 + 7a = 8 + 20 Combine like terms: -20 + 20 = 0 0 + 7a = 8 + 20 7a = 8 + 20 Combine like terms: 8 + 20 = 28 7a = 28 Divide each side by '7'. a = 4 Simplifying a = 4
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