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Simplifying 3X + 7 = 5X + -21 Reorder the terms: 7 + 3X = 5X + -21 Reorder the terms: 7 + 3X = -21 + 5X Solving 7 + 3X = -21 + 5X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5X' to each side of the equation. 7 + 3X + -5X = -21 + 5X + -5X Combine like terms: 3X + -5X = -2X 7 + -2X = -21 + 5X + -5X Combine like terms: 5X + -5X = 0 7 + -2X = -21 + 0 7 + -2X = -21 Add '-7' to each side of the equation. 7 + -7 + -2X = -21 + -7 Combine like terms: 7 + -7 = 0 0 + -2X = -21 + -7 -2X = -21 + -7 Combine like terms: -21 + -7 = -28 -2X = -28 Divide each side by '-2'. X = 14 Simplifying X = 14
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