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Simplifying 21x + -7 = 9 + 13x Reorder the terms: -7 + 21x = 9 + 13x Solving -7 + 21x = 9 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. -7 + 21x + -13x = 9 + 13x + -13x Combine like terms: 21x + -13x = 8x -7 + 8x = 9 + 13x + -13x Combine like terms: 13x + -13x = 0 -7 + 8x = 9 + 0 -7 + 8x = 9 Add '7' to each side of the equation. -7 + 7 + 8x = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 8x = 9 + 7 8x = 9 + 7 Combine like terms: 9 + 7 = 16 8x = 16 Divide each side by '8'. x = 2 Simplifying x = 2
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