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Simplifying 28 = 3x + -1(12 + -1x) 28 = 3x + (12 * -1 + -1x * -1) 28 = 3x + (-12 + 1x) Reorder the terms: 28 = -12 + 3x + 1x Combine like terms: 3x + 1x = 4x 28 = -12 + 4x Solving 28 = -12 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 28 + -4x = -12 + 4x + -4x Combine like terms: 4x + -4x = 0 28 + -4x = -12 + 0 28 + -4x = -12 Add '-28' to each side of the equation. 28 + -28 + -4x = -12 + -28 Combine like terms: 28 + -28 = 0 0 + -4x = -12 + -28 -4x = -12 + -28 Combine like terms: -12 + -28 = -40 -4x = -40 Divide each side by '-4'. x = 10 Simplifying x = 10
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