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Simplifying 7x + -21 + -1x = -9 + 18x Reorder the terms: -21 + 7x + -1x = -9 + 18x Combine like terms: 7x + -1x = 6x -21 + 6x = -9 + 18x Solving -21 + 6x = -9 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. -21 + 6x + -18x = -9 + 18x + -18x Combine like terms: 6x + -18x = -12x -21 + -12x = -9 + 18x + -18x Combine like terms: 18x + -18x = 0 -21 + -12x = -9 + 0 -21 + -12x = -9 Add '21' to each side of the equation. -21 + 21 + -12x = -9 + 21 Combine like terms: -21 + 21 = 0 0 + -12x = -9 + 21 -12x = -9 + 21 Combine like terms: -9 + 21 = 12 -12x = 12 Divide each side by '-12'. x = -1 Simplifying x = -1
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