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80-\left(x-1\right)=10\left(2x-1\right)-5\left(4x-5\right)
Multiply both sides of the equation by 40, the least common multiple of 40,4,8.
80-x-\left(-1\right)=10\left(2x-1\right)-5\left(4x-5\right)
To find the opposite of x-1, find the opposite of each term.
80-x+1=10\left(2x-1\right)-5\left(4x-5\right)
The opposite of -1 is 1.
81-x=10\left(2x-1\right)-5\left(4x-5\right)
Add 80 and 1 to get 81.
81-x=20x-10-5\left(4x-5\right)
Use the distributive property to multiply 10 by 2x-1.
81-x=20x-10-20x+25
Use the distributive property to multiply -5 by 4x-5.
81-x=-10+25
Combine 20x and -20x to get 0.
81-x=15
Add -10 and 25 to get 15.
-x=15-81
Subtract 81 from both sides.
-x=-66
Subtract 81 from 15 to get -66.
x=66
Multiply both sides by -1.