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Simplifying 9 + -9x = 87 + -30x Solving 9 + -9x = 87 + -30x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30x' to each side of the equation. 9 + -9x + 30x = 87 + -30x + 30x Combine like terms: -9x + 30x = 21x 9 + 21x = 87 + -30x + 30x Combine like terms: -30x + 30x = 0 9 + 21x = 87 + 0 9 + 21x = 87 Add '-9' to each side of the equation. 9 + -9 + 21x = 87 + -9 Combine like terms: 9 + -9 = 0 0 + 21x = 87 + -9 21x = 87 + -9 Combine like terms: 87 + -9 = 78 21x = 78 Divide each side by '21'. x = 3.714285714 Simplifying x = 3.714285714
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