Tf ‘+’ means ‘-’,‘-’ means ‘+’, ‘x’ means ‘$$\div$$’ and ‘$$\div$$’ means ‘x’, then the value of $$\frac{[(30\times5)+(84\times6)]\div5}{[\frac{2}{3}\div18]-[4\div2]}$$ is:
$$\frac{[(30\times5)+(84\times6)]\div5}{[\frac{2}{3}\div18]-[4\div2]}$$
On change the sign,
= $$\frac{[(30\div5)-(84\div6)]\times5}{[\frac{2}{3}\times18]+[4\times2]}$$
= $$\frac{[6-14]\times5}{12+8}$$ = -40/20 = -2
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