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Simplifying 7x + 2(7x + 2) = 151 Reorder the terms: 7x + 2(2 + 7x) = 151 7x + (2 * 2 + 7x * 2) = 151 7x + (4 + 14x) = 151 Reorder the terms: 4 + 7x + 14x = 151 Combine like terms: 7x + 14x = 21x 4 + 21x = 151 Solving 4 + 21x = 151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 21x = 151 + -4 Combine like terms: 4 + -4 = 0 0 + 21x = 151 + -4 21x = 151 + -4 Combine like terms: 151 + -4 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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