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Simplifying -21 + -7 = x Combine like terms: -21 + -7 = -28 -28 = x Solving -28 = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -28 + -1x = x + -1x Combine like terms: x + -1x = 0 -28 + -1x = 0 Add '28' to each side of the equation. -28 + 28 + -1x = 0 + 28 Combine like terms: -28 + 28 = 0 0 + -1x = 0 + 28 -1x = 0 + 28 Combine like terms: 0 + 28 = 28 -1x = 28 Divide each side by '-1'. x = -28 Simplifying x = -28
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