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I need help with this

I need help with this-example-1

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5x(15-2x) = 5x(15) - 5x(2x) = 75x - 10x^2
The order of operation first is parenthesis then the x^2, x, / and *, then + and - from left to right. The equation is simplified as 75x - 10x^2.
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