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Simplifying -56 = 7(1 + -3x) -56 = (1 * 7 + -3x * 7) -56 = (7 + -21x) Solving -56 = 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. -56 + 21x = 7 + -21x + 21x Combine like terms: -21x + 21x = 0 -56 + 21x = 7 + 0 -56 + 21x = 7 Add '56' to each side of the equation. -56 + 56 + 21x = 7 + 56 Combine like terms: -56 + 56 = 0 0 + 21x = 7 + 56 21x = 7 + 56 Combine like terms: 7 + 56 = 63 21x = 63 Divide each side by '21'. x = 3 Simplifying x = 3
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