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Simplifying x + 20 = 3x + 42 Reorder the terms: 20 + x = 3x + 42 Reorder the terms: 20 + x = 42 + 3x Solving 20 + x = 42 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 20 + x + -3x = 42 + 3x + -3x Combine like terms: x + -3x = -2x 20 + -2x = 42 + 3x + -3x Combine like terms: 3x + -3x = 0 20 + -2x = 42 + 0 20 + -2x = 42 Add '-20' to each side of the equation. 20 + -20 + -2x = 42 + -20 Combine like terms: 20 + -20 = 0 0 + -2x = 42 + -20 -2x = 42 + -20 Combine like terms: 42 + -20 = 22 -2x = 22 Divide each side by '-2'. x = -11 Simplifying x = -11
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