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Simplifying -9x + 7(-3x + -3) = -42 + -9x Reorder the terms: -9x + 7(-3 + -3x) = -42 + -9x -9x + (-3 * 7 + -3x * 7) = -42 + -9x -9x + (-21 + -21x) = -42 + -9x Reorder the terms: -21 + -9x + -21x = -42 + -9x Combine like terms: -9x + -21x = -30x -21 + -30x = -42 + -9x Solving -21 + -30x = -42 + -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. -21 + -30x + 9x = -42 + -9x + 9x Combine like terms: -30x + 9x = -21x -21 + -21x = -42 + -9x + 9x Combine like terms: -9x + 9x = 0 -21 + -21x = -42 + 0 -21 + -21x = -42 Add '21' to each side of the equation. -21 + 21 + -21x = -42 + 21 Combine like terms: -21 + 21 = 0 0 + -21x = -42 + 21 -21x = -42 + 21 Combine like terms: -42 + 21 = -21 -21x = -21 Divide each side by '-21'. x = 1 Simplifying x = 1
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