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Simplifying 21x + 5 = 15x + -5 Reorder the terms: 5 + 21x = 15x + -5 Reorder the terms: 5 + 21x = -5 + 15x Solving 5 + 21x = -5 + 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. 5 + 21x + -15x = -5 + 15x + -15x Combine like terms: 21x + -15x = 6x 5 + 6x = -5 + 15x + -15x Combine like terms: 15x + -15x = 0 5 + 6x = -5 + 0 5 + 6x = -5 Add '-5' to each side of the equation. 5 + -5 + 6x = -5 + -5 Combine like terms: 5 + -5 = 0 0 + 6x = -5 + -5 6x = -5 + -5 Combine like terms: -5 + -5 = -10 6x = -10 Divide each side by '6'. x = -1.666666667 Simplifying x = -1.666666667
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