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40x+16=6x-\left(-x-7\right)-2\left(-x+3\right)
Use the distributive property to multiply -8 by -5x-2.
40x+16=6x-\left(-x\right)-\left(-7\right)-2\left(-x+3\right)
To find the opposite of -x-7, find the opposite of each term.
40x+16=6x-\left(-x\right)+7-2\left(-x+3\right)
The opposite of -7 is 7.
40x+16=6x-\left(-x\right)+7-2\left(-x\right)-6
Use the distributive property to multiply -2 by -x+3.
40x+16=6x-\left(-x\right)+7+2x-6
Multiply -2 and -1 to get 2.
40x+16=8x-\left(-x\right)+7-6
Combine 6x and 2x to get 8x.
40x+16=8x-\left(-x\right)+1
Subtract 6 from 7 to get 1.
40x+16-8x=-\left(-x\right)+1
Subtract 8x from both sides.
32x+16=-\left(-x\right)+1
Combine 40x and -8x to get 32x.
32x+16-x=1
Add -x to both sides.
32x-x=1-16
Subtract 16 from both sides.
32x-x=-15
Subtract 16 from 1 to get -15.
31x=-15
Combine 32x and -x to get 31x.
x=\frac{-15}{31}
Divide both sides by 31.
x=-\frac{15}{31}
Fraction \frac{-15}{31} can be rewritten as -\frac{15}{31} by extracting the negative sign.