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10x-5x^{2}+4x\left(2x-5\right)-\left(3x-4\right)
Use the distributive property to multiply 5x by 2-x.
10x-5x^{2}+8x^{2}-20x-\left(3x-4\right)
Use the distributive property to multiply 4x by 2x-5.
10x+3x^{2}-20x-\left(3x-4\right)
Combine -5x^{2} and 8x^{2} to get 3x^{2}.
-10x+3x^{2}-\left(3x-4\right)
Combine 10x and -20x to get -10x.
-10x+3x^{2}-3x-\left(-4\right)
To find the opposite of 3x-4, find the opposite of each term.
-10x+3x^{2}-3x+4
The opposite of -4 is 4.
-13x+3x^{2}+4
Combine -10x and -3x to get -13x.
10x-5x^{2}+4x\left(2x-5\right)-\left(3x-4\right)
Use the distributive property to multiply 5x by 2-x.
10x-5x^{2}+8x^{2}-20x-\left(3x-4\right)
Use the distributive property to multiply 4x by 2x-5.
10x+3x^{2}-20x-\left(3x-4\right)
Combine -5x^{2} and 8x^{2} to get 3x^{2}.
-10x+3x^{2}-\left(3x-4\right)
Combine 10x and -20x to get -10x.
-10x+3x^{2}-3x-\left(-4\right)
To find the opposite of 3x-4, find the opposite of each term.
-10x+3x^{2}-3x+4
The opposite of -4 is 4.
-13x+3x^{2}+4
Combine -10x and -3x to get -13x.