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Simplifying -5(7a + -6) = 21 Reorder the terms: -5(-6 + 7a) = 21 (-6 * -5 + 7a * -5) = 21 (30 + -35a) = 21 Solving 30 + -35a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -35a = 21 + -30 Combine like terms: 30 + -30 = 0 0 + -35a = 21 + -30 -35a = 21 + -30 Combine like terms: 21 + -30 = -9 -35a = -9 Divide each side by '-35'. a = 0.2571428571 Simplifying a = 0.2571428571
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