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2x-1/3x=2
1,(6)x=2
x=6/5
b) 8x-3 =11x-1/2
2,5=3x
x=2,5/3
x=25/30
x=5/6
c)x/3 = x-2/5
1/3x=x-2/5
-2/3x=-2/5
x=6/10
x=4/5
d) 2/3(x+3)-3/7 (x+4) = 1
2/3x + 2 - 3/7x + 12/7=1
14/21x - 9/21x = -1 + 12/7
5/21x = 5/7
5x=15
x=3