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10-3x-\left(-8\right)=7-4x
To find the opposite of 3x-8, find the opposite of each term.
10-3x+8=7-4x
The opposite of -8 is 8.
18-3x=7-4x
Add 10 and 8 to get 18.
18-3x+4x=7
Add 4x to both sides.
18+x=7
Combine -3x and 4x to get x.
x=7-18
Subtract 18 from both sides.
x=-11
Subtract 18 from 7 to get -11.