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Simplifying 21x + -7 = 8 + 16x Reorder the terms: -7 + 21x = 8 + 16x Solving -7 + 21x = 8 + 16x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16x' to each side of the equation. -7 + 21x + -16x = 8 + 16x + -16x Combine like terms: 21x + -16x = 5x -7 + 5x = 8 + 16x + -16x Combine like terms: 16x + -16x = 0 -7 + 5x = 8 + 0 -7 + 5x = 8 Add '7' to each side of the equation. -7 + 7 + 5x = 8 + 7 Combine like terms: -7 + 7 = 0 0 + 5x = 8 + 7 5x = 8 + 7 Combine like terms: 8 + 7 = 15 5x = 15 Divide each side by '5'. x = 3 Simplifying x = 3
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