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Simplifying 7a + -15 + -9a + 25 = 90 Reorder the terms: -15 + 25 + 7a + -9a = 90 Combine like terms: -15 + 25 = 10 10 + 7a + -9a = 90 Combine like terms: 7a + -9a = -2a 10 + -2a = 90 Solving 10 + -2a = 90 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -2a = 90 + -10 Combine like terms: 10 + -10 = 0 0 + -2a = 90 + -10 -2a = 90 + -10 Combine like terms: 90 + -10 = 80 -2a = 80 Divide each side by '-2'. a = -40 Simplifying a = -40
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