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Simplifying -72 + (-66) = x -72 + -66 = x Combine like terms: -72 + -66 = -138 -138 = x Solving -138 = 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. -138 + -1x = x + -1x Combine like terms: x + -1x = 0 -138 + -1x = 0 Add '138' to each side of the equation. -138 + 138 + -1x = 0 + 138 Combine like terms: -138 + 138 = 0 0 + -1x = 0 + 138 -1x = 0 + 138 Combine like terms: 0 + 138 = 138 -1x = 138 Divide each side by '-1'. x = -138 Simplifying x = -138
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