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Simplifying x + 7 = 31 + 3x Reorder the terms: 7 + x = 31 + 3x Solving 7 + 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. 7 + x + -3x = 31 + 3x + -3x Combine like terms: x + -3x = -2x 7 + -2x = 31 + 3x + -3x Combine like terms: 3x + -3x = 0 7 + -2x = 31 + 0 7 + -2x = 31 Add '-7' to each side of the equation. 7 + -7 + -2x = 31 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 31 + -7 -2x = 31 + -7 Combine like terms: 31 + -7 = 24 -2x = 24 Divide each side by '-2'. x = -12 Simplifying x = -12
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