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Simplifying 15x + 9 = 28x + -20 Reorder the terms: 9 + 15x = 28x + -20 Reorder the terms: 9 + 15x = -20 + 28x Solving 9 + 15x = -20 + 28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28x' to each side of the equation. 9 + 15x + -28x = -20 + 28x + -28x Combine like terms: 15x + -28x = -13x 9 + -13x = -20 + 28x + -28x Combine like terms: 28x + -28x = 0 9 + -13x = -20 + 0 9 + -13x = -20 Add '-9' to each side of the equation. 9 + -9 + -13x = -20 + -9 Combine like terms: 9 + -9 = 0 0 + -13x = -20 + -9 -13x = -20 + -9 Combine like terms: -20 + -9 = -29 -13x = -29 Divide each side by '-13'. x = 2.230769231 Simplifying x = 2.230769231
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