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Simplifying -21 + -20x = 8x + 15 Reorder the terms: -21 + -20x = 15 + 8x Solving -21 + -20x = 15 + 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 + -20x + -8x = 15 + 8x + -8x Combine like terms: -20x + -8x = -28x -21 + -28x = 15 + 8x + -8x Combine like terms: 8x + -8x = 0 -21 + -28x = 15 + 0 -21 + -28x = 15 Add '21' to each side of the equation. -21 + 21 + -28x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + -28x = 15 + 21 -28x = 15 + 21 Combine like terms: 15 + 21 = 36 -28x = 36 Divide each side by '-28'. x = -1.285714286 Simplifying x = -1.285714286
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