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Simplifying (-2a + 5) + -1(7a + -4) = 0 Reorder the terms: (5 + -2a) + -1(7a + -4) = 0 Remove parenthesis around (5 + -2a) 5 + -2a + -1(7a + -4) = 0 Reorder the terms: 5 + -2a + -1(-4 + 7a) = 0 5 + -2a + (-4 * -1 + 7a * -1) = 0 5 + -2a + (4 + -7a) = 0 Reorder the terms: 5 + 4 + -2a + -7a = 0 Combine like terms: 5 + 4 = 9 9 + -2a + -7a = 0 Combine like terms: -2a + -7a = -9a 9 + -9a = 0 Solving 9 + -9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -9a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -9a = 0 + -9 -9a = 0 + -9 Combine like terms: 0 + -9 = -9 -9a = -9 Divide each side by '-9'. a = 1 Simplifying a = 1
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