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Simplifying 7(a + -3) = 9 Reorder the terms: 7(-3 + a) = 9 (-3 * 7 + a * 7) = 9 (-21 + 7a) = 9 Solving -21 + 7a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 7a = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 7a = 9 + 21 7a = 9 + 21 Combine like terms: 9 + 21 = 30 7a = 30 Divide each side by '7'. a = 4.285714286 Simplifying a = 4.285714286
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