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Simplifying 21x + 7 = 13x + -9 Reorder the terms: 7 + 21x = 13x + -9 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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