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Simplifying -78 = 3(9 + -7x) -78 = (9 * 3 + -7x * 3) -78 = (27 + -21x) Solving -78 = 27 + -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. -78 + 21x = 27 + -21x + 21x Combine like terms: -21x + 21x = 0 -78 + 21x = 27 + 0 -78 + 21x = 27 Add '78' to each side of the equation. -78 + 78 + 21x = 27 + 78 Combine like terms: -78 + 78 = 0 0 + 21x = 27 + 78 21x = 27 + 78 Combine like terms: 27 + 78 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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