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Simplifying 8(x + 15) = 21 Reorder the terms: 8(15 + x) = 21 (15 * 8 + x * 8) = 21 (120 + 8x) = 21 Solving 120 + 8x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-120' to each side of the equation. 120 + -120 + 8x = 21 + -120 Combine like terms: 120 + -120 = 0 0 + 8x = 21 + -120 8x = 21 + -120 Combine like terms: 21 + -120 = -99 8x = -99 Divide each side by '8'. x = -12.375 Simplifying x = -12.375
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