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Simplifying -7(4a + -9) = -19 Reorder the terms: -7(-9 + 4a) = -19 (-9 * -7 + 4a * -7) = -19 (63 + -28a) = -19 Solving 63 + -28a = -19 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -28a = -19 + -63 Combine like terms: 63 + -63 = 0 0 + -28a = -19 + -63 -28a = -19 + -63 Combine like terms: -19 + -63 = -82 -28a = -82 Divide each side by '-28'. a = 2.928571429 Simplifying a = 2.928571429
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