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Simplifying -1[7(a + 2b) + 4b] = 0 -1[(a * 7 + 2b * 7) + 4b] = 0 -1[(7a + 14b) + 4b] = 0 Combine like terms: 14b + 4b = 18b -1[7a + 18b] = 0 [7a * -1 + 18b * -1] = 0 [-7a + -18b] = 0 Solving -7a + -18b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '18b' to each side of the equation. -7a + -18b + 18b = 0 + 18b Combine like terms: -18b + 18b = 0 -7a + 0 = 0 + 18b -7a = 0 + 18b Remove the zero: -7a = 18b Divide each side by '-7'. a = -2.571428571b Simplifying a = -2.571428571b
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