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Simplifying 7x + -7 = -7x + 21 Reorder the terms: -7 + 7x = -7x + 21 Reorder the terms: -7 + 7x = 21 + -7x Solving -7 + 7x = 21 + -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 + 7x + 7x = 21 + -7x + 7x Combine like terms: 7x + 7x = 14x -7 + 14x = 21 + -7x + 7x Combine like terms: -7x + 7x = 0 -7 + 14x = 21 + 0 -7 + 14x = 21 Add '7' to each side of the equation. -7 + 7 + 14x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 14x = 21 + 7 14x = 21 + 7 Combine like terms: 21 + 7 = 28 14x = 28 Divide each side by '14'. x = 2 Simplifying x = 2
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