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15-8-\left(-5x\right)=7x+4-3x
To find the opposite of 8-5x, find the opposite of each term.
15-8+5x=7x+4-3x
The opposite of -5x is 5x.
7+5x=7x+4-3x
Subtract 8 from 15 to get 7.
7+5x=4x+4
Combine 7x and -3x to get 4x.
7+5x-4x=4
Subtract 4x from both sides.
7+x=4
Combine 5x and -4x to get x.
x=4-7
Subtract 7 from both sides.
x=-3
Subtract 7 from 4 to get -3.