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Simplifying 87 = -11x + 21 Reorder the terms: 87 = 21 + -11x Solving 87 = 21 + -11x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11x' to each side of the equation. 87 + 11x = 21 + -11x + 11x Combine like terms: -11x + 11x = 0 87 + 11x = 21 + 0 87 + 11x = 21 Add '-87' to each side of the equation. 87 + -87 + 11x = 21 + -87 Combine like terms: 87 + -87 = 0 0 + 11x = 21 + -87 11x = 21 + -87 Combine like terms: 21 + -87 = -66 11x = -66 Divide each side by '11'. x = -6 Simplifying x = -6
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