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Simplifying 20 = 3X + X Combine like terms: 3X + X = 4X 20 = 4X Solving 20 = 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. 20 + -4X = 4X + -4X Combine like terms: 4X + -4X = 0 20 + -4X = 0 Add '-20' to each side of the equation. 20 + -20 + -4X = 0 + -20 Combine like terms: 20 + -20 = 0 0 + -4X = 0 + -20 -4X = 0 + -20 Combine like terms: 0 + -20 = -20 -4X = -20 Divide each side by '-4'. X = 5 Simplifying X = 5
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