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Simplifying 3x + -7 = 8x + -21 Reorder the terms: -7 + 3x = 8x + -21 Reorder the terms: -7 + 3x = -21 + 8x Solving -7 + 3x = -21 + 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. -7 + 3x + -8x = -21 + 8x + -8x Combine like terms: 3x + -8x = -5x -7 + -5x = -21 + 8x + -8x Combine like terms: 8x + -8x = 0 -7 + -5x = -21 + 0 -7 + -5x = -21 Add '7' to each side of the equation. -7 + 7 + -5x = -21 + 7 Combine like terms: -7 + 7 = 0 0 + -5x = -21 + 7 -5x = -21 + 7 Combine like terms: -21 + 7 = -14 -5x = -14 Divide each side by '-5'. x = 2.8 Simplifying x = 2.8
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