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Simplifying 9x + -7 = 21x + 1 Reorder the terms: -7 + 9x = 21x + 1 Reorder the terms: -7 + 9x = 1 + 21x Solving -7 + 9x = 1 + 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. -7 + 9x + -21x = 1 + 21x + -21x Combine like terms: 9x + -21x = -12x -7 + -12x = 1 + 21x + -21x Combine like terms: 21x + -21x = 0 -7 + -12x = 1 + 0 -7 + -12x = 1 Add '7' to each side of the equation. -7 + 7 + -12x = 1 + 7 Combine like terms: -7 + 7 = 0 0 + -12x = 1 + 7 -12x = 1 + 7 Combine like terms: 1 + 7 = 8 -12x = 8 Divide each side by '-12'. x = -0.6666666667 Simplifying x = -0.6666666667
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