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Simplifying 3 + 9x = 91 + x Solving 3 + 9x = 91 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 3 + 9x + -1x = 91 + x + -1x Combine like terms: 9x + -1x = 8x 3 + 8x = 91 + x + -1x Combine like terms: x + -1x = 0 3 + 8x = 91 + 0 3 + 8x = 91 Add '-3' to each side of the equation. 3 + -3 + 8x = 91 + -3 Combine like terms: 3 + -3 = 0 0 + 8x = 91 + -3 8x = 91 + -3 Combine like terms: 91 + -3 = 88 8x = 88 Divide each side by '8'. x = 11 Simplifying x = 11
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