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Simplifying 7x + x + (x + 3) = 39 Reorder the terms: 7x + x + (3 + x) = 39 Remove parenthesis around (3 + x) 7x + x + 3 + x = 39 Reorder the terms: 3 + 7x + x + x = 39 Combine like terms: 7x + x = 8x 3 + 8x + x = 39 Combine like terms: 8x + x = 9x 3 + 9x = 39 Solving 3 + 9x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 9x = 39 + -3 Combine like terms: 3 + -3 = 0 0 + 9x = 39 + -3 9x = 39 + -3 Combine like terms: 39 + -3 = 36 9x = 36 Divide each side by '9'. x = 4 Simplifying x = 4
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