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Simplifying -90 = x + (-3) -90 = x + -3 Reorder the terms: -90 = -3 + x Solving -90 = -3 + 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. -90 + -1x = -3 + x + -1x Combine like terms: x + -1x = 0 -90 + -1x = -3 + 0 -90 + -1x = -3 Add '90' to each side of the equation. -90 + 90 + -1x = -3 + 90 Combine like terms: -90 + 90 = 0 0 + -1x = -3 + 90 -1x = -3 + 90 Combine like terms: -3 + 90 = 87 -1x = 87 Divide each side by '-1'. x = -87 Simplifying x = -87
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