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x+1+3=9\left(x-4\right)
Multiply both sides of the equation by 3.
x+4=9\left(x-4\right)
Add 1 and 3 to get 4.
x+4=9x-36
Use the distributive property to multiply 9 by x-4.
x+4-9x=-36
Subtract 9x from both sides.
-8x+4=-36
Combine x and -9x to get -8x.
-8x=-36-4
Subtract 4 from both sides.
-8x=-40
Subtract 4 from -36 to get -40.
x=\frac{-40}{-8}
Divide both sides by -8.
x=5
Divide -40 by -8 to get 5.