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Simplifying -3(5 + 7x) = 216 (5 * -3 + 7x * -3) = 216 (-15 + -21x) = 216 Solving -15 + -21x = 216 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -21x = 216 + 15 Combine like terms: -15 + 15 = 0 0 + -21x = 216 + 15 -21x = 216 + 15 Combine like terms: 216 + 15 = 231 -21x = 231 Divide each side by '-21'. x = -11 Simplifying x = -11
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