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Simplifying 84 = 7(7 + -1X) 84 = (7 * 7 + -1X * 7) 84 = (49 + -7X) Solving 84 = 49 + -7X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '7X' to each side of the equation. 84 + 7X = 49 + -7X + 7X Combine like terms: -7X + 7X = 0 84 + 7X = 49 + 0 84 + 7X = 49 Add '-84' to each side of the equation. 84 + -84 + 7X = 49 + -84 Combine like terms: 84 + -84 = 0 0 + 7X = 49 + -84 7X = 49 + -84 Combine like terms: 49 + -84 = -35 7X = -35 Divide each side by '7'. X = -5 Simplifying X = -5
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