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Simplifying -31 = 4x + -81 Reorder the terms: -31 = -81 + 4x Solving -31 = -81 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -31 + -4x = -81 + 4x + -4x Combine like terms: 4x + -4x = 0 -31 + -4x = -81 + 0 -31 + -4x = -81 Add '31' to each side of the equation. -31 + 31 + -4x = -81 + 31 Combine like terms: -31 + 31 = 0 0 + -4x = -81 + 31 -4x = -81 + 31 Combine like terms: -81 + 31 = -50 -4x = -50 Divide each side by '-4'. x = 12.5 Simplifying x = 12.5
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