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Simplifying 8 + -9x = 21 + -16x Solving 8 + -9x = 21 + -16x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16x' to each side of the equation. 8 + -9x + 16x = 21 + -16x + 16x Combine like terms: -9x + 16x = 7x 8 + 7x = 21 + -16x + 16x Combine like terms: -16x + 16x = 0 8 + 7x = 21 + 0 8 + 7x = 21 Add '-8' to each side of the equation. 8 + -8 + 7x = 21 + -8 Combine like terms: 8 + -8 = 0 0 + 7x = 21 + -8 7x = 21 + -8 Combine like terms: 21 + -8 = 13 7x = 13 Divide each side by '7'. x = 1.857142857 Simplifying x = 1.857142857
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