express $20$ as a product of prime factors
2+2-5=?
1÷4×100=
4x(x-3)+2x(4x+3)
express 140 as a product of prime factor
1+1=
$\frac{-1}{36}$ - $\frac{5}{144}$
2 divide by 21
=
59 divide by 9 =
x+Y =-1
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