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