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Simplifying 9 + -7x = 90 + -28x Solving 9 + -7x = 90 + -28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28x' to each side of the equation. 9 + -7x + 28x = 90 + -28x + 28x Combine like terms: -7x + 28x = 21x 9 + 21x = 90 + -28x + 28x Combine like terms: -28x + 28x = 0 9 + 21x = 90 + 0 9 + 21x = 90 Add '-9' to each side of the equation. 9 + -9 + 21x = 90 + -9 Combine like terms: 9 + -9 = 0 0 + 21x = 90 + -9 21x = 90 + -9 Combine like terms: 90 + -9 = 81 21x = 81 Divide each side by '21'. x = 3.857142857 Simplifying x = 3.857142857
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