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Simplifying 157 = 3 + 7(1 + 3x) 157 = 3 + (1 * 7 + 3x * 7) 157 = 3 + (7 + 21x) Combine like terms: 3 + 7 = 10 157 = 10 + 21x Solving 157 = 10 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 157 + -21x = 10 + 21x + -21x Combine like terms: 21x + -21x = 0 157 + -21x = 10 + 0 157 + -21x = 10 Add '-157' to each side of the equation. 157 + -157 + -21x = 10 + -157 Combine like terms: 157 + -157 = 0 0 + -21x = 10 + -157 -21x = 10 + -157 Combine like terms: 10 + -157 = -147 -21x = -147 Divide each side by '-21'. x = 7 Simplifying x = 7
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