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x+3+5\left(x-1\right)=7\left(x+1\right)
Multiply both sides of the equation by 35, the least common multiple of 35,7,5.
x+3+5x-5=7\left(x+1\right)
Use the distributive property to multiply 5 by x-1.
6x+3-5=7\left(x+1\right)
Combine x and 5x to get 6x.
6x-2=7\left(x+1\right)
Subtract 5 from 3 to get -2.
6x-2=7x+7
Use the distributive property to multiply 7 by x+1.
6x-2-7x=7
Subtract 7x from both sides.
-x-2=7
Combine 6x and -7x to get -x.
-x=7+2
Add 2 to both sides.
-x=9
Add 7 and 2 to get 9.
x=-9
Multiply both sides by -1.