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Simplifying 6 + -7x = 7x + -9x + 21 Reorder the terms: 6 + -7x = 21 + 7x + -9x Combine like terms: 7x + -9x = -2x 6 + -7x = 21 + -2x Solving 6 + -7x = 21 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 6 + -7x + 2x = 21 + -2x + 2x Combine like terms: -7x + 2x = -5x 6 + -5x = 21 + -2x + 2x Combine like terms: -2x + 2x = 0 6 + -5x = 21 + 0 6 + -5x = 21 Add '-6' to each side of the equation. 6 + -6 + -5x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + -5x = 21 + -6 -5x = 21 + -6 Combine like terms: 21 + -6 = 15 -5x = 15 Divide each side by '-5'. x = -3 Simplifying x = -3
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