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Simplifying 20x + 28 = 21 + -15x Reorder the terms: 28 + 20x = 21 + -15x Solving 28 + 20x = 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. 28 + 20x + 15x = 21 + -15x + 15x Combine like terms: 20x + 15x = 35x 28 + 35x = 21 + -15x + 15x Combine like terms: -15x + 15x = 0 28 + 35x = 21 + 0 28 + 35x = 21 Add '-28' to each side of the equation. 28 + -28 + 35x = 21 + -28 Combine like terms: 28 + -28 = 0 0 + 35x = 21 + -28 35x = 21 + -28 Combine like terms: 21 + -28 = -7 35x = -7 Divide each side by '35'. x = -0.2 Simplifying x = -0.2
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