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Simplifying (7x + -15) + (9a + 25) = 90 Reorder the terms: (-15 + 7x) + (9a + 25) = 90 Remove parenthesis around (-15 + 7x) -15 + 7x + (9a + 25) = 90 Reorder the terms: -15 + 7x + (25 + 9a) = 90 Remove parenthesis around (25 + 9a) -15 + 7x + 25 + 9a = 90 Reorder the terms: -15 + 25 + 9a + 7x = 90 Combine like terms: -15 + 25 = 10 10 + 9a + 7x = 90 Solving 10 + 9a + 7x = 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 + 9a + -10 + 7x = 90 + -10 Reorder the terms: 10 + -10 + 9a + 7x = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 9a + 7x = 90 + -10 9a + 7x = 90 + -10 Combine like terms: 90 + -10 = 80 9a + 7x = 80 Add '-7x' to each side of the equation. 9a + 7x + -7x = 80 + -7x Combine like terms: 7x + -7x = 0 9a + 0 = 80 + -7x 9a = 80 + -7x Divide each side by '9'. a = 8.888888889 + -0.7777777778x Simplifying a = 8.888888889 + -0.7777777778x
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