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Simplifying 3x + 1 + 4 * 3x = 21 Multiply 4 * 3 3x + 1 + 12x = 21 Reorder the terms: 1 + 3x + 12x = 21 Combine like terms: 3x + 12x = 15x 1 + 15x = 21 Solving 1 + 15x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 15x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 15x = 21 + -1 15x = 21 + -1 Combine like terms: 21 + -1 = 20 15x = 20 Divide each side by '15'. x = 1.333333333 Simplifying x = 1.333333333
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