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Simplifying -10a + 9 + 20b = 30 + n Reorder the terms: 9 + -10a + 20b = 30 + n Solving 9 + -10a + 20b = 30 + n Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -10a + -9 + 20b = 30 + -9 + n Reorder the terms: 9 + -9 + -10a + 20b = 30 + -9 + n Combine like terms: 9 + -9 = 0 0 + -10a + 20b = 30 + -9 + n -10a + 20b = 30 + -9 + n Combine like terms: 30 + -9 = 21 -10a + 20b = 21 + n Add '-20b' to each side of the equation. -10a + 20b + -20b = 21 + -20b + n Combine like terms: 20b + -20b = 0 -10a + 0 = 21 + -20b + n -10a = 21 + -20b + n Divide each side by '-10'. a = -2.1 + 2b + -0.1n Simplifying a = -2.1 + 2b + -0.1n
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