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Simplifying 15x + 20(x + -2) = 450 Reorder the terms: 15x + 20(-2 + x) = 450 15x + (-2 * 20 + x * 20) = 450 15x + (-40 + 20x) = 450 Reorder the terms: -40 + 15x + 20x = 450 Combine like terms: 15x + 20x = 35x -40 + 35x = 450 Solving -40 + 35x = 450 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + 35x = 450 + 40 Combine like terms: -40 + 40 = 0 0 + 35x = 450 + 40 35x = 450 + 40 Combine like terms: 450 + 40 = 490 35x = 490 Divide each side by '35'. x = 14 Simplifying x = 14
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