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Simplifying -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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