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