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Simplifying -63 + -7x = 7x + 21 Reorder the terms: -63 + -7x = 21 + 7x Solving -63 + -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. -63 + -7x + -7x = 21 + 7x + -7x Combine like terms: -7x + -7x = -14x -63 + -14x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 -63 + -14x = 21 + 0 -63 + -14x = 21 Add '63' to each side of the equation. -63 + 63 + -14x = 21 + 63 Combine like terms: -63 + 63 = 0 0 + -14x = 21 + 63 -14x = 21 + 63 Combine like terms: 21 + 63 = 84 -14x = 84 Divide each side by '-14'. x = -6 Simplifying x = -6
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