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Simplifying 20 + 3x = 12 + -1x Solving 20 + 3x = 12 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 20 + 3x + x = 12 + -1x + x Combine like terms: 3x + x = 4x 20 + 4x = 12 + -1x + x Combine like terms: -1x + x = 0 20 + 4x = 12 + 0 20 + 4x = 12 Add '-20' to each side of the equation. 20 + -20 + 4x = 12 + -20 Combine like terms: 20 + -20 = 0 0 + 4x = 12 + -20 4x = 12 + -20 Combine like terms: 12 + -20 = -8 4x = -8 Divide each side by '4'. x = -2 Simplifying x = -2
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