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Simplifying 31 = 7x + 2x + 4 Reorder the terms: 31 = 4 + 7x + 2x Combine like terms: 7x + 2x = 9x 31 = 4 + 9x Solving 31 = 4 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 31 + -9x = 4 + 9x + -9x Combine like terms: 9x + -9x = 0 31 + -9x = 4 + 0 31 + -9x = 4 Add '-31' to each side of the equation. 31 + -31 + -9x = 4 + -31 Combine like terms: 31 + -31 = 0 0 + -9x = 4 + -31 -9x = 4 + -31 Combine like terms: 4 + -31 = -27 -9x = -27 Divide each side by '-9'. x = 3 Simplifying x = 3
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