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Simplifying 3a + -7(5a + -4) = 0 Reorder the terms: 3a + -7(-4 + 5a) = 0 3a + (-4 * -7 + 5a * -7) = 0 3a + (28 + -35a) = 0 Reorder the terms: 28 + 3a + -35a = 0 Combine like terms: 3a + -35a = -32a 28 + -32a = 0 Solving 28 + -32a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -32a = 0 + -28 Combine like terms: 28 + -28 = 0 0 + -32a = 0 + -28 -32a = 0 + -28 Combine like terms: 0 + -28 = -28 -32a = -28 Divide each side by '-32'. a = 0.875 Simplifying a = 0.875
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