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-1+5x-2\left(3x+4\right)=7\left(x+1\right)
Subtract 7 from 6 to get -1.
-1+5x-6x-8=7\left(x+1\right)
Use the distributive property to multiply -2 by 3x+4.
-1-x-8=7\left(x+1\right)
Combine 5x and -6x to get -x.
-9-x=7\left(x+1\right)
Subtract 8 from -1 to get -9.
-9-x=7x+7
Use the distributive property to multiply 7 by x+1.
-9-x-7x=7
Subtract 7x from both sides.
-9-8x=7
Combine -x and -7x to get -8x.
-8x=7+9
Add 9 to both sides.
-8x=16
Add 7 and 9 to get 16.
x=\frac{16}{-8}
Divide both sides by -8.
x=-2
Divide 16 by -8 to get -2.