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Simplifying 3(1 + 7x) + -15 = 9 (1 * 3 + 7x * 3) + -15 = 9 (3 + 21x) + -15 = 9 Reorder the terms: 3 + -15 + 21x = 9 Combine like terms: 3 + -15 = -12 -12 + 21x = 9 Solving -12 + 21x = 9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 21x = 9 + 12 Combine like terms: -12 + 12 = 0 0 + 21x = 9 + 12 21x = 9 + 12 Combine like terms: 9 + 12 = 21 21x = 21 Divide each side by '21'. x = 1 Simplifying x = 1
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