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Simplifying 7(a + -1) = 45 Reorder the terms: 7(-1 + a) = 45 (-1 * 7 + a * 7) = 45 (-7 + 7a) = 45 Solving -7 + 7a = 45 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 + 7a = 45 + 7 Combine like terms: -7 + 7 = 0 0 + 7a = 45 + 7 7a = 45 + 7 Combine like terms: 45 + 7 = 52 7a = 52 Divide each side by '7'. a = 7.428571429 Simplifying a = 7.428571429
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