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Simplifying 3x + 20 = x + 7 Reorder the terms: 20 + 3x = x + 7 Reorder the terms: 20 + 3x = 7 + x Solving 20 + 3x = 7 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 20 + 3x + -1x = 7 + x + -1x Combine like terms: 3x + -1x = 2x 20 + 2x = 7 + x + -1x Combine like terms: x + -1x = 0 20 + 2x = 7 + 0 20 + 2x = 7 Add '-20' to each side of the equation. 20 + -20 + 2x = 7 + -20 Combine like terms: 20 + -20 = 0 0 + 2x = 7 + -20 2x = 7 + -20 Combine like terms: 7 + -20 = -13 2x = -13 Divide each side by '2'. x = -6.5 Simplifying x = -6.5
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