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Simplifying 4a + 20 = 2a + 30 Reorder the terms: 20 + 4a = 2a + 30 Reorder the terms: 20 + 4a = 30 + 2a Solving 20 + 4a = 30 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 20 + 4a + -2a = 30 + 2a + -2a Combine like terms: 4a + -2a = 2a 20 + 2a = 30 + 2a + -2a Combine like terms: 2a + -2a = 0 20 + 2a = 30 + 0 20 + 2a = 30 Add '-20' to each side of the equation. 20 + -20 + 2a = 30 + -20 Combine like terms: 20 + -20 = 0 0 + 2a = 30 + -20 2a = 30 + -20 Combine like terms: 30 + -20 = 10 2a = 10 Divide each side by '2'. a = 5 Simplifying a = 5
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