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85x-24x^{2}-75=\left(6x-11\right)\left(7-4x\right)
Use the distributive property to multiply 3x-5 by 15-8x and combine like terms.
85x-24x^{2}-75=86x-24x^{2}-77
Use the distributive property to multiply 6x-11 by 7-4x and combine like terms.
85x-24x^{2}-75-86x=-24x^{2}-77
Subtract 86x from both sides.
-x-24x^{2}-75=-24x^{2}-77
Combine 85x and -86x to get -x.
-x-24x^{2}-75+24x^{2}=-77
Add 24x^{2} to both sides.
-x-75=-77
Combine -24x^{2} and 24x^{2} to get 0.
-x=-77+75
Add 75 to both sides.
-x=-2
Add -77 and 75 to get -2.
x=2
Multiply both sides by -1.