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Simplifying 87 + -7x = 20x + 21 Reorder the terms: 87 + -7x = 21 + 20x Solving 87 + -7x = 21 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 87 + -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x 87 + -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 87 + -27x = 21 + 0 87 + -27x = 21 Add '-87' to each side of the equation. 87 + -87 + -27x = 21 + -87 Combine like terms: 87 + -87 = 0 0 + -27x = 21 + -87 -27x = 21 + -87 Combine like terms: 21 + -87 = -66 -27x = -66 Divide each side by '-27'. x = 2.444444444 Simplifying x = 2.444444444
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