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Simplifying 21x + 4 = 15x + -8 Reorder the terms: 4 + 21x = 15x + -8 Reorder the terms: 4 + 21x = -8 + 15x Solving 4 + 21x = -8 + 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 = -8 + 15x + -15x Combine like terms: 21x + -15x = 6x 4 + 6x = -8 + 15x + -15x Combine like terms: 15x + -15x = 0 4 + 6x = -8 + 0 4 + 6x = -8 Add '-4' to each side of the equation. 4 + -4 + 6x = -8 + -4 Combine like terms: 4 + -4 = 0 0 + 6x = -8 + -4 6x = -8 + -4 Combine like terms: -8 + -4 = -12 6x = -12 Divide each side by '6'. x = -2 Simplifying x = -2
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