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Simplifying 16 + 5 = -3(7x + -7) Combine like terms: 16 + 5 = 21 21 = -3(7x + -7) Reorder the terms: 21 = -3(-7 + 7x) 21 = (-7 * -3 + 7x * -3) 21 = (21 + -21x) Add '-21' to each side of the equation. 21 + -21 = 21 + -21 + -21x Combine like terms: 21 + -21 = 0 0 = 21 + -21 + -21x Combine like terms: 21 + -21 = 0 0 = 0 + -21x 0 = -21x Solving 0 = -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 0 + 21x = -21x + 21x Remove the zero: 21x = -21x + 21x Combine like terms: -21x + 21x = 0 21x = 0 Divide each side by '21'. x = 0 Simplifying x = 0
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