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Simplifying 77 + 9x = 91 + 7x Solving 77 + 9x = 91 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 77 + 9x + -7x = 91 + 7x + -7x Combine like terms: 9x + -7x = 2x 77 + 2x = 91 + 7x + -7x Combine like terms: 7x + -7x = 0 77 + 2x = 91 + 0 77 + 2x = 91 Add '-77' to each side of the equation. 77 + -77 + 2x = 91 + -77 Combine like terms: 77 + -77 = 0 0 + 2x = 91 + -77 2x = 91 + -77 Combine like terms: 91 + -77 = 14 2x = 14 Divide each side by '2'. x = 7 Simplifying x = 7
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