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Simplifying 6x + 21 = 15x + -56 Reorder the terms: 21 + 6x = 15x + -56 Reorder the terms: 21 + 6x = -56 + 15x Solving 21 + 6x = -56 + 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. 21 + 6x + -15x = -56 + 15x + -15x Combine like terms: 6x + -15x = -9x 21 + -9x = -56 + 15x + -15x Combine like terms: 15x + -15x = 0 21 + -9x = -56 + 0 21 + -9x = -56 Add '-21' to each side of the equation. 21 + -21 + -9x = -56 + -21 Combine like terms: 21 + -21 = 0 0 + -9x = -56 + -21 -9x = -56 + -21 Combine like terms: -56 + -21 = -77 -9x = -77 Divide each side by '-9'. x = 8.555555556 Simplifying x = 8.555555556
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