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Simplifying 21 + 15x + 7 = -1x + 12 Reorder the terms: 21 + 7 + 15x = -1x + 12 Combine like terms: 21 + 7 = 28 28 + 15x = -1x + 12 Reorder the terms: 28 + 15x = 12 + -1x Solving 28 + 15x = 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. 28 + 15x + x = 12 + -1x + x Combine like terms: 15x + x = 16x 28 + 16x = 12 + -1x + x Combine like terms: -1x + x = 0 28 + 16x = 12 + 0 28 + 16x = 12 Add '-28' to each side of the equation. 28 + -28 + 16x = 12 + -28 Combine like terms: 28 + -28 = 0 0 + 16x = 12 + -28 16x = 12 + -28 Combine like terms: 12 + -28 = -16 16x = -16 Divide each side by '16'. x = -1 Simplifying x = -1
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