Add sub fractions

What is 4 1/2+2/7-213/14?

Correct result:

x =  -10.4286

Solution:

a=412=4⋅ 2+12=92=4.5 b=27≐0.2857 c=21314≐15.2143  x=a+b−c=4.5+0.2857−15.2143=−737=−10.4286

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