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Simplifying -12 + -66 = -9x + 21 Combine like terms: -12 + -66 = -78 -78 = -9x + 21 Reorder the terms: -78 = 21 + -9x Solving -78 = 21 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. -78 + 9x = 21 + -9x + 9x Combine like terms: -9x + 9x = 0 -78 + 9x = 21 + 0 -78 + 9x = 21 Add '78' to each side of the equation. -78 + 78 + 9x = 21 + 78 Combine like terms: -78 + 78 = 0 0 + 9x = 21 + 78 9x = 21 + 78 Combine like terms: 21 + 78 = 99 9x = 99 Divide each side by '9'. x = 11 Simplifying x = 11
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