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Simplifying 18x = 84 + -1(7x + 9) Reorder the terms: 18x = 84 + -1(9 + 7x) 18x = 84 + (9 * -1 + 7x * -1) 18x = 84 + (-9 + -7x) Combine like terms: 84 + -9 = 75 18x = 75 + -7x Solving 18x = 75 + -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. 18x + 7x = 75 + -7x + 7x Combine like terms: 18x + 7x = 25x 25x = 75 + -7x + 7x Combine like terms: -7x + 7x = 0 25x = 75 + 0 25x = 75 Divide each side by '25'. x = 3 Simplifying x = 3
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