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Simplifying 5a + -2[4a + 5] = 7a Reorder the terms: 5a + -2[5 + 4a] = 7a 5a + [5 * -2 + 4a * -2] = 7a 5a + [-10 + -8a] = 7a Reorder the terms: -10 + 5a + -8a = 7a Combine like terms: 5a + -8a = -3a -10 + -3a = 7a Solving -10 + -3a = 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. -10 + -3a + -7a = 7a + -7a Combine like terms: -3a + -7a = -10a -10 + -10a = 7a + -7a Combine like terms: 7a + -7a = 0 -10 + -10a = 0 Add '10' to each side of the equation. -10 + 10 + -10a = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -10a = 0 + 10 -10a = 0 + 10 Combine like terms: 0 + 10 = 10 -10a = 10 Divide each side by '-10'. a = -1 Simplifying a = -1
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