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Simplifying x + 31 = 4x + 13 Reorder the terms: 31 + x = 4x + 13 Reorder the terms: 31 + x = 13 + 4x Solving 31 + x = 13 + 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 + x + -4x = 13 + 4x + -4x Combine like terms: x + -4x = -3x 31 + -3x = 13 + 4x + -4x Combine like terms: 4x + -4x = 0 31 + -3x = 13 + 0 31 + -3x = 13 Add '-31' to each side of the equation. 31 + -31 + -3x = 13 + -31 Combine like terms: 31 + -31 = 0 0 + -3x = 13 + -31 -3x = 13 + -31 Combine like terms: 13 + -31 = -18 -3x = -18 Divide each side by '-3'. x = 6 Simplifying x = 6
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