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Simplifying 21x + -9 = 5x + 7 Reorder the terms: -9 + 21x = 5x + 7 Reorder the terms: -9 + 21x = 7 + 5x Solving -9 + 21x = 7 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. -9 + 21x + -5x = 7 + 5x + -5x Combine like terms: 21x + -5x = 16x -9 + 16x = 7 + 5x + -5x Combine like terms: 5x + -5x = 0 -9 + 16x = 7 + 0 -9 + 16x = 7 Add '9' to each side of the equation. -9 + 9 + 16x = 7 + 9 Combine like terms: -9 + 9 = 0 0 + 16x = 7 + 9 16x = 7 + 9 Combine like terms: 7 + 9 = 16 16x = 16 Divide each side by '16'. x = 1 Simplifying x = 1
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