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Simplifying -7 + 12 + -20 = x Combine like terms: -7 + 12 = 5 5 + -20 = x Combine like terms: 5 + -20 = -15 -15 = x Solving -15 = 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. -15 + -1x = x + -1x Combine like terms: x + -1x = 0 -15 + -1x = 0 Add '15' to each side of the equation. -15 + 15 + -1x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -1x = 0 + 15 -1x = 0 + 15 Combine like terms: 0 + 15 = 15 -1x = 15 Divide each side by '-1'. x = -15 Simplifying x = -15
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