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Simplifying 3 + -4X = 21 + 2X Solving 3 + -4X = 21 + 2X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-2X' to each side of the equation. 3 + -4X + -2X = 21 + 2X + -2X Combine like terms: -4X + -2X = -6X 3 + -6X = 21 + 2X + -2X Combine like terms: 2X + -2X = 0 3 + -6X = 21 + 0 3 + -6X = 21 Add '-3' to each side of the equation. 3 + -3 + -6X = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -6X = 21 + -3 -6X = 21 + -3 Combine like terms: 21 + -3 = 18 -6X = 18 Divide each side by '-6'. X = -3 Simplifying X = -3
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