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5/3x+1/3x=3x+40/3+7/3x

3(5/3x+1/3x)=3(3x+40/3+7/3x)
7x+1x=9x+9+7x
7x=17x+9x=9

from your line

3(5/3x+1/3x)=3(3x+40/3+7/3x)
I get
5x + x = 9x + 40 + 7x
6x - 16x = 40
-10x = 40
x = -4

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