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Simplifying 161 = -7(1 + 3x) 161 = (1 * -7 + 3x * -7) 161 = (-7 + -21x) Solving 161 = -7 + -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. 161 + 21x = -7 + -21x + 21x Combine like terms: -21x + 21x = 0 161 + 21x = -7 + 0 161 + 21x = -7 Add '-161' to each side of the equation. 161 + -161 + 21x = -7 + -161 Combine like terms: 161 + -161 = 0 0 + 21x = -7 + -161 21x = -7 + -161 Combine like terms: -7 + -161 = -168 21x = -168 Divide each side by '21'. x = -8 Simplifying x = -8
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