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Simplifying -15 + (-7) + 9 = x -15 + -7 + 9 = x Combine like terms: -15 + -7 = -22 -22 + 9 = x Combine like terms: -22 + 9 = -13 -13 = x Solving -13 = 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. -13 + -1x = x + -1x Combine like terms: x + -1x = 0 -13 + -1x = 0 Add '13' to each side of the equation. -13 + 13 + -1x = 0 + 13 Combine like terms: -13 + 13 = 0 0 + -1x = 0 + 13 -1x = 0 + 13 Combine like terms: 0 + 13 = 13 -1x = 13 Divide each side by '-1'. x = -13 Simplifying x = -13
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