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Simplifying -133 = 7(-4 + 3x) -133 = (-4 * 7 + 3x * 7) -133 = (-28 + 21x) Solving -133 = -28 + 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. -133 + -21x = -28 + 21x + -21x Combine like terms: 21x + -21x = 0 -133 + -21x = -28 + 0 -133 + -21x = -28 Add '133' to each side of the equation. -133 + 133 + -21x = -28 + 133 Combine like terms: -133 + 133 = 0 0 + -21x = -28 + 133 -21x = -28 + 133 Combine like terms: -28 + 133 = 105 -21x = 105 Divide each side by '-21'. x = -5 Simplifying x = -5
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