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Simplifying 20 + -16a = 4(10 + -8a) 20 + -16a = (10 * 4 + -8a * 4) 20 + -16a = (40 + -32a) Solving 20 + -16a = 40 + -32a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '32a' to each side of the equation. 20 + -16a + 32a = 40 + -32a + 32a Combine like terms: -16a + 32a = 16a 20 + 16a = 40 + -32a + 32a Combine like terms: -32a + 32a = 0 20 + 16a = 40 + 0 20 + 16a = 40 Add '-20' to each side of the equation. 20 + -20 + 16a = 40 + -20 Combine like terms: 20 + -20 = 0 0 + 16a = 40 + -20 16a = 40 + -20 Combine like terms: 40 + -20 = 20 16a = 20 Divide each side by '16'. a = 1.25 Simplifying a = 1.25
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