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Simplifying 105 + -3X = 4X + -21 Reorder the terms: 105 + -3X = -21 + 4X Solving 105 + -3X = -21 + 4X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-4X' to each side of the equation. 105 + -3X + -4X = -21 + 4X + -4X Combine like terms: -3X + -4X = -7X 105 + -7X = -21 + 4X + -4X Combine like terms: 4X + -4X = 0 105 + -7X = -21 + 0 105 + -7X = -21 Add '-105' to each side of the equation. 105 + -105 + -7X = -21 + -105 Combine like terms: 105 + -105 = 0 0 + -7X = -21 + -105 -7X = -21 + -105 Combine like terms: -21 + -105 = -126 -7X = -126 Divide each side by '-7'. X = 18 Simplifying X = 18
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