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Simplifying x + -13 = -3x + 31 Reorder the terms: -13 + x = -3x + 31 Reorder the terms: -13 + x = 31 + -3x Solving -13 + x = 31 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. -13 + x + 3x = 31 + -3x + 3x Combine like terms: x + 3x = 4x -13 + 4x = 31 + -3x + 3x Combine like terms: -3x + 3x = 0 -13 + 4x = 31 + 0 -13 + 4x = 31 Add '13' to each side of the equation. -13 + 13 + 4x = 31 + 13 Combine like terms: -13 + 13 = 0 0 + 4x = 31 + 13 4x = 31 + 13 Combine like terms: 31 + 13 = 44 4x = 44 Divide each side by '4'. x = 11 Simplifying x = 11
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