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Simplifying 3 + 7x = 3(1 + x) 3 + 7x = (1 * 3 + x * 3) 3 + 7x = (3 + 3x) Add '-3' to each side of the equation. 3 + -3 + 7x = 3 + -3 + 3x Combine like terms: 3 + -3 = 0 0 + 7x = 3 + -3 + 3x 7x = 3 + -3 + 3x Combine like terms: 3 + -3 = 0 7x = 0 + 3x 7x = 3x Solving 7x = 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. 7x + -3x = 3x + -3x Combine like terms: 7x + -3x = 4x 4x = 3x + -3x Combine like terms: 3x + -3x = 0 4x = 0 Divide each side by '4'. x = 0 Simplifying x = 0
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