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Simplifying 3x + 1 + 3x + 1 = 9x + -31 Reorder the terms: 1 + 1 + 3x + 3x = 9x + -31 Combine like terms: 1 + 1 = 2 2 + 3x + 3x = 9x + -31 Combine like terms: 3x + 3x = 6x 2 + 6x = 9x + -31 Reorder the terms: 2 + 6x = -31 + 9x Solving 2 + 6x = -31 + 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. 2 + 6x + -9x = -31 + 9x + -9x Combine like terms: 6x + -9x = -3x 2 + -3x = -31 + 9x + -9x Combine like terms: 9x + -9x = 0 2 + -3x = -31 + 0 2 + -3x = -31 Add '-2' to each side of the equation. 2 + -2 + -3x = -31 + -2 Combine like terms: 2 + -2 = 0 0 + -3x = -31 + -2 -3x = -31 + -2 Combine like terms: -31 + -2 = -33 -3x = -33 Divide each side by '-3'. x = 11 Simplifying x = 11
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