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Simplifying -7(3a + 3) = 105 Reorder the terms: -7(3 + 3a) = 105 (3 * -7 + 3a * -7) = 105 (-21 + -21a) = 105 Solving -21 + -21a = 105 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 + -21a = 105 + 21 Combine like terms: -21 + 21 = 0 0 + -21a = 105 + 21 -21a = 105 + 21 Combine like terms: 105 + 21 = 126 -21a = 126 Divide each side by '-21'. a = -6 Simplifying a = -6
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