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Simplifying 3 + -1x = 12 + x Solving 3 + -1x = 12 + 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. 3 + -1x + -1x = 12 + x + -1x Combine like terms: -1x + -1x = -2x 3 + -2x = 12 + x + -1x Combine like terms: x + -1x = 0 3 + -2x = 12 + 0 3 + -2x = 12 Add '-3' to each side of the equation. 3 + -3 + -2x = 12 + -3 Combine like terms: 3 + -3 = 0 0 + -2x = 12 + -3 -2x = 12 + -3 Combine like terms: 12 + -3 = 9 -2x = 9 Divide each side by '-2'. x = -4.5 Simplifying x = -4.5
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