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Simplifying 4X + 12 = -21 + 7X Reorder the terms: 12 + 4X = -21 + 7X Solving 12 + 4X = -21 + 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. 12 + 4X + -7X = -21 + 7X + -7X Combine like terms: 4X + -7X = -3X 12 + -3X = -21 + 7X + -7X Combine like terms: 7X + -7X = 0 12 + -3X = -21 + 0 12 + -3X = -21 Add '-12' to each side of the equation. 12 + -12 + -3X = -21 + -12 Combine like terms: 12 + -12 = 0 0 + -3X = -21 + -12 -3X = -21 + -12 Combine like terms: -21 + -12 = -33 -3X = -33 Divide each side by '-3'. X = 11 Simplifying X = 11
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