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135+(5x-4)(3x+31)(7x-64)(4x+15)+120(6x-8)=900
We move all terms to the left:
135+(5x-4)(3x+31)(7x-64)(4x+15)+120(6x-8)-(900)=0
We add all the numbers together, and all the variables
(5x-4)(3x+31)(7x-64)(4x+15)+120(6x-8)-765=0
We multiply parentheses
(5x-4)(3x+31)(7x-64)(4x+15)+720x-960-765=0
We multiply parentheses ..
(+15x^2+155x-12x-124)(7x-64)(4x+15)+720x-960-765=0
We add all the numbers together, and all the variables
(+15x^2+155x-12x-124)(7x-64)(4x+15)+720x-1725=0
We multiply parentheses ..
(+15x^2+155x-12x-124)(+28x^2+105x-256x-960)+720x-1725=0
We move all terms containing x to the left, all other terms to the right
(+15x^2+155x-12x-124)(+28x^2+105x-256x-960)+720x=1725
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