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Simplifying 3(-7x + -9) = -90 Reorder the terms: 3(-9 + -7x) = -90 (-9 * 3 + -7x * 3) = -90 (-27 + -21x) = -90 Solving -27 + -21x = -90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + -21x = -90 + 27 Combine like terms: -27 + 27 = 0 0 + -21x = -90 + 27 -21x = -90 + 27 Combine like terms: -90 + 27 = -63 -21x = -63 Divide each side by '-21'. x = 3 Simplifying x = 3
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