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Simplifying 9 + -7x = 2x + 90 Reorder the terms: 9 + -7x = 90 + 2x Solving 9 + -7x = 90 + 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. 9 + -7x + -2x = 90 + 2x + -2x Combine like terms: -7x + -2x = -9x 9 + -9x = 90 + 2x + -2x Combine like terms: 2x + -2x = 0 9 + -9x = 90 + 0 9 + -9x = 90 Add '-9' to each side of the equation. 9 + -9 + -9x = 90 + -9 Combine like terms: 9 + -9 = 0 0 + -9x = 90 + -9 -9x = 90 + -9 Combine like terms: 90 + -9 = 81 -9x = 81 Divide each side by '-9'. x = -9 Simplifying x = -9
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