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Simplifying 54 = 3(-3 + 7x) 54 = (-3 * 3 + 7x * 3) 54 = (-9 + 21x) Solving 54 = -9 + 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. 54 + -21x = -9 + 21x + -21x Combine like terms: 21x + -21x = 0 54 + -21x = -9 + 0 54 + -21x = -9 Add '-54' to each side of the equation. 54 + -54 + -21x = -9 + -54 Combine like terms: 54 + -54 = 0 0 + -21x = -9 + -54 -21x = -9 + -54 Combine like terms: -9 + -54 = -63 -21x = -63 Divide each side by '-21'. x = 3 Simplifying x = 3
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