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Simplifying 3 + 4x = 31 + -3x Solving 3 + 4x = 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. 3 + 4x + 3x = 31 + -3x + 3x Combine like terms: 4x + 3x = 7x 3 + 7x = 31 + -3x + 3x Combine like terms: -3x + 3x = 0 3 + 7x = 31 + 0 3 + 7x = 31 Add '-3' to each side of the equation. 3 + -3 + 7x = 31 + -3 Combine like terms: 3 + -3 = 0 0 + 7x = 31 + -3 7x = 31 + -3 Combine like terms: 31 + -3 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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