If the mathematical operator '$$+$$' means division, '$$-$$' means multiplication, '$$\times$$' means subtraction and '$$\div$$' means addition, then the value of
$$1 \times 7 + 21 \times 2 \div 2 + 3 - 4$$ is
$$1 \times 7 + 21 \times 2 \div 2 + 3 - 4$$
After changing the signs
$$1-7\div21-2+2\div3\times\ 4$$
$$1-\frac{1}{3}-2+\frac{2}{3}\times\ 4$$
$$\frac{2}{3}-2+\frac{8}{3}=\frac{4}{3}$$ .
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