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Simplifying 77 = x + 3x + 9 Reorder the terms: 77 = 9 + x + 3x Combine like terms: x + 3x = 4x 77 = 9 + 4x Solving 77 = 9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 77 + -4x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 77 + -4x = 9 + 0 77 + -4x = 9 Add '-77' to each side of the equation. 77 + -77 + -4x = 9 + -77 Combine like terms: 77 + -77 = 0 0 + -4x = 9 + -77 -4x = 9 + -77 Combine like terms: 9 + -77 = -68 -4x = -68 Divide each side by '-4'. x = 17 Simplifying x = 17
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