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Simplifying -168 = -7(3 + 3x) -168 = (3 * -7 + 3x * -7) -168 = (-21 + -21x) Solving -168 = -21 + -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. -168 + 21x = -21 + -21x + 21x Combine like terms: -21x + 21x = 0 -168 + 21x = -21 + 0 -168 + 21x = -21 Add '168' to each side of the equation. -168 + 168 + 21x = -21 + 168 Combine like terms: -168 + 168 = 0 0 + 21x = -21 + 168 21x = -21 + 168 Combine like terms: -21 + 168 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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