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Simplifying 81 + -3x = 15x + 21 Reorder the terms: 81 + -3x = 21 + 15x Solving 81 + -3x = 21 + 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. 81 + -3x + -15x = 21 + 15x + -15x Combine like terms: -3x + -15x = -18x 81 + -18x = 21 + 15x + -15x Combine like terms: 15x + -15x = 0 81 + -18x = 21 + 0 81 + -18x = 21 Add '-81' to each side of the equation. 81 + -81 + -18x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -18x = 21 + -81 -18x = 21 + -81 Combine like terms: 21 + -81 = -60 -18x = -60 Divide each side by '-18'. x = 3.333333333 Simplifying x = 3.333333333
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