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Simplifying 93 = -3(3a + -7) Reorder the terms: 93 = -3(-7 + 3a) 93 = (-7 * -3 + 3a * -3) 93 = (21 + -9a) Solving 93 = 21 + -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. 93 + 9a = 21 + -9a + 9a Combine like terms: -9a + 9a = 0 93 + 9a = 21 + 0 93 + 9a = 21 Add '-93' to each side of the equation. 93 + -93 + 9a = 21 + -93 Combine like terms: 93 + -93 = 0 0 + 9a = 21 + -93 9a = 21 + -93 Combine like terms: 21 + -93 = -72 9a = -72 Divide each side by '9'. a = -8 Simplifying a = -8
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