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x=57-75
x= -18
1 2/3+y=2 3/4
y=2 3/4 -1 2/3
y=2 9/12-1 8/12
y=1 1/12
t-34=-35
t= -35+34
t= -1
3-x=-2
-x= -2-3
-x= -5/*(-1)
x=5
5y=13/:5
y=13/5
y=2 3/5
1/7x=-2/:1/7
x= -2*7
x= -14
b/3=45
b=45*3
b=135
7a+7=35
7a=35-7
7a=28/:7
a=4
2-2x=5
-2x=5-2
-2x= 3/:(-2)
x= -3/2
x= -1 1/2