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