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Simplifying -15(-3a + -4.2b + 3.9) = 0 Reorder the terms: -15(3.9 + -3a + -4.2b) = 0 (3.9 * -15 + -3a * -15 + -4.2b * -15) = 0 (-58.5 + 45a + 63b) = 0 Solving -58.5 + 45a + 63b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '58.5' to each side of the equation. -58.5 + 45a + 58.5 + 63b = 0 + 58.5 Reorder the terms: -58.5 + 58.5 + 45a + 63b = 0 + 58.5 Combine like terms: -58.5 + 58.5 = 0.0 0.0 + 45a + 63b = 0 + 58.5 45a + 63b = 0 + 58.5 Combine like terms: 0 + 58.5 = 58.5 45a + 63b = 58.5 Add '-63b' to each side of the equation. 45a + 63b + -63b = 58.5 + -63b Combine like terms: 63b + -63b = 0 45a + 0 = 58.5 + -63b 45a = 58.5 + -63b Divide each side by '45'. a = 1.3 + -1.4b Simplifying a = 1.3 + -1.4b
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