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Simplifying 7a + -15 = 9a + 25 Reorder the terms: -15 + 7a = 9a + 25 Reorder the terms: -15 + 7a = 25 + 9a Solving -15 + 7a = 25 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -15 + 7a + -9a = 25 + 9a + -9a Combine like terms: 7a + -9a = -2a -15 + -2a = 25 + 9a + -9a Combine like terms: 9a + -9a = 0 -15 + -2a = 25 + 0 -15 + -2a = 25 Add '15' to each side of the equation. -15 + 15 + -2a = 25 + 15 Combine like terms: -15 + 15 = 0 0 + -2a = 25 + 15 -2a = 25 + 15 Combine like terms: 25 + 15 = 40 -2a = 40 Divide each side by '-2'. a = -20 Simplifying a = -20
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