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Simplifying 8a + 20 + -5a = 7a Reorder the terms: 20 + 8a + -5a = 7a Combine like terms: 8a + -5a = 3a 20 + 3a = 7a Solving 20 + 3a = 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. 20 + 3a + -7a = 7a + -7a Combine like terms: 3a + -7a = -4a 20 + -4a = 7a + -7a Combine like terms: 7a + -7a = 0 20 + -4a = 0 Add '-20' to each side of the equation. 20 + -20 + -4a = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -4a = 0 + -20 -4a = 0 + -20 Combine like terms: 0 + -20 = -20 -4a = -20 Divide each side by '-4'. a = 5 Simplifying a = 5
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