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15x-8x-\left(-5\right)=26
To find the opposite of 8x-5, find the opposite of each term.
15x-8x+5=26
The opposite of -5 is 5.
7x+5=26
Combine 15x and -8x to get 7x.
7x=26-5
Subtract 5 from both sides.
7x=21
Subtract 5 from 26 to get 21.
x=\frac{21}{7}
Divide both sides by 7.
x=3
Divide 21 by 7 to get 3.