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3x+9=7\left(x-5\right)
Use the distributive property to multiply 3 by x+3.
3x+9=7x-35
Use the distributive property to multiply 7 by x-5.
3x+9-7x=-35
Subtract 7x from both sides.
-4x+9=-35
Combine 3x and -7x to get -4x.
-4x=-35-9
Subtract 9 from both sides.
-4x=-44
Subtract 9 from -35 to get -44.
x=\frac{-44}{-4}
Divide both sides by -4.
x=11
Divide -44 by -4 to get 11.