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Simplifying -84 = -3(7 + -3x) -84 = (7 * -3 + -3x * -3) -84 = (-21 + 9x) Solving -84 = -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. -84 + -9x = -21 + 9x + -9x Combine like terms: 9x + -9x = 0 -84 + -9x = -21 + 0 -84 + -9x = -21 Add '84' to each side of the equation. -84 + 84 + -9x = -21 + 84 Combine like terms: -84 + 84 = 0 0 + -9x = -21 + 84 -9x = -21 + 84 Combine like terms: -21 + 84 = 63 -9x = 63 Divide each side by '-9'. x = -7 Simplifying x = -7
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