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Simplifying x + 12 = 3x + 20 Reorder the terms: 12 + x = 3x + 20 Reorder the terms: 12 + x = 20 + 3x Solving 12 + x = 20 + 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. 12 + x + -3x = 20 + 3x + -3x Combine like terms: x + -3x = -2x 12 + -2x = 20 + 3x + -3x Combine like terms: 3x + -3x = 0 12 + -2x = 20 + 0 12 + -2x = 20 Add '-12' to each side of the equation. 12 + -12 + -2x = 20 + -12 Combine like terms: 12 + -12 = 0 0 + -2x = 20 + -12 -2x = 20 + -12 Combine like terms: 20 + -12 = 8 -2x = 8 Divide each side by '-2'. x = -4 Simplifying x = -4
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