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Simplifying 7(a + -7) = 45 Reorder the terms: 7(-7 + a) = 45 (-7 * 7 + a * 7) = 45 (-49 + 7a) = 45 Solving -49 + 7a = 45 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + 7a = 45 + 49 Combine like terms: -49 + 49 = 0 0 + 7a = 45 + 49 7a = 45 + 49 Combine like terms: 45 + 49 = 94 7a = 94 Divide each side by '7'. a = 13.42857143 Simplifying a = 13.42857143
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