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Simplifying 4a + -15 = 2a + 85 Reorder the terms: -15 + 4a = 2a + 85 Reorder the terms: -15 + 4a = 85 + 2a Solving -15 + 4a = 85 + 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. -15 + 4a + -2a = 85 + 2a + -2a Combine like terms: 4a + -2a = 2a -15 + 2a = 85 + 2a + -2a Combine like terms: 2a + -2a = 0 -15 + 2a = 85 + 0 -15 + 2a = 85 Add '15' to each side of the equation. -15 + 15 + 2a = 85 + 15 Combine like terms: -15 + 15 = 0 0 + 2a = 85 + 15 2a = 85 + 15 Combine like terms: 85 + 15 = 100 2a = 100 Divide each side by '2'. a = 50 Simplifying a = 50
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