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