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Simplifying (9x + 4) + -1(2x + -21) = 39 Reorder the terms: (4 + 9x) + -1(2x + -21) = 39 Remove parenthesis around (4 + 9x) 4 + 9x + -1(2x + -21) = 39 Reorder the terms: 4 + 9x + -1(-21 + 2x) = 39 4 + 9x + (-21 * -1 + 2x * -1) = 39 4 + 9x + (21 + -2x) = 39 Reorder the terms: 4 + 21 + 9x + -2x = 39 Combine like terms: 4 + 21 = 25 25 + 9x + -2x = 39 Combine like terms: 9x + -2x = 7x 25 + 7x = 39 Solving 25 + 7x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 7x = 39 + -25 Combine like terms: 25 + -25 = 0 0 + 7x = 39 + -25 7x = 39 + -25 Combine like terms: 39 + -25 = 14 7x = 14 Divide each side by '7'. x = 2 Simplifying x = 2
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