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Simplifying 21x + 4 = 15x + -80 Reorder the terms: 4 + 21x = 15x + -80 Reorder the terms: 4 + 21x = -80 + 15x Solving 4 + 21x = -80 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 4 + 21x + -15x = -80 + 15x + -15x Combine like terms: 21x + -15x = 6x 4 + 6x = -80 + 15x + -15x Combine like terms: 15x + -15x = 0 4 + 6x = -80 + 0 4 + 6x = -80 Add '-4' to each side of the equation. 4 + -4 + 6x = -80 + -4 Combine like terms: 4 + -4 = 0 0 + 6x = -80 + -4 6x = -80 + -4 Combine like terms: -80 + -4 = -84 6x = -84 Divide each side by '6'. x = -14 Simplifying x = -14
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