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Simplifying 15x + -21 = 8x + -28 Reorder the terms: -21 + 15x = 8x + -28 Reorder the terms: -21 + 15x = -28 + 8x Solving -21 + 15x = -28 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. -21 + 15x + -8x = -28 + 8x + -8x Combine like terms: 15x + -8x = 7x -21 + 7x = -28 + 8x + -8x Combine like terms: 8x + -8x = 0 -21 + 7x = -28 + 0 -21 + 7x = -28 Add '21' to each side of the equation. -21 + 21 + 7x = -28 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = -28 + 21 7x = -28 + 21 Combine like terms: -28 + 21 = -7 7x = -7 Divide each side by '7'. x = -1 Simplifying x = -1
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