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Simplifying 3 + -7x + 3x + 9 = 31 Reorder the terms: 3 + 9 + -7x + 3x = 31 Combine like terms: 3 + 9 = 12 12 + -7x + 3x = 31 Combine like terms: -7x + 3x = -4x 12 + -4x = 31 Solving 12 + -4x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -4x = 31 + -12 Combine like terms: 12 + -12 = 0 0 + -4x = 31 + -12 -4x = 31 + -12 Combine like terms: 31 + -12 = 19 -4x = 19 Divide each side by '-4'. x = -4.75 Simplifying x = -4.75
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