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Simplifying 21x + -7 = 7x Reorder the terms: -7 + 21x = 7x Solving -7 + 21x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. -7 + 21x + -7x = 7x + -7x Combine like terms: 21x + -7x = 14x -7 + 14x = 7x + -7x Combine like terms: 7x + -7x = 0 -7 + 14x = 0 Add '7' to each side of the equation. -7 + 7 + 14x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + 14x = 0 + 7 14x = 0 + 7 Combine like terms: 0 + 7 = 7 14x = 7 Divide each side by '14'. x = 0.5 Simplifying x = 0.5
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