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Simplifying 7x + 21x + -28 = 0 Reorder the terms: -28 + 7x + 21x = 0 Combine like terms: 7x + 21x = 28x -28 + 28x = 0 Solving -28 + 28x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 28x = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 28x = 0 + 28 28x = 0 + 28 Combine like terms: 0 + 28 = 28 28x = 28 Divide each side by '28'. x = 1 Simplifying x = 1
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