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Simplifying -12 + [-1(-5)] = x Multiply -1 * -5 -12 + [5] = x -12 + 5 = x Combine like terms: -12 + 5 = -7 -7 = x Solving -7 = 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. -7 + -1x = x + -1x Combine like terms: x + -1x = 0 -7 + -1x = 0 Add '7' to each side of the equation. -7 + 7 + -1x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1x = 0 + 7 -1x = 0 + 7 Combine like terms: 0 + 7 = 7 -1x = 7 Divide each side by '-1'. x = -7 Simplifying x = -7
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