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5x+1x=13\times 3+1+8x
Multiply both sides of the equation by 3.
6x=13\times 3+1+8x
Combine 5x and 1x to get 6x.
6x=39+1+8x
Multiply 13 and 3 to get 39.
6x=40+8x
Add 39 and 1 to get 40.
6x-8x=40
Subtract 8x from both sides.
-2x=40
Combine 6x and -8x to get -2x.
x=\frac{40}{-2}
Divide both sides by -2.
x=-20
Divide 40 by -2 to get -20.