Solution
Given that,
$$7.5 + (5.4 \div 4.5 \times 2) - 8 \times 4 \div 3.2$$
$$\Rightarrow 7.5 + (1.2\times 2) - 8 \times 4 \div 3.2$$
$$\Rightarrow 7.5 + (2.4) - 8 \times 4 \div 3.2$$
$$\Rightarrow 7.5 + (2.4) - 8 \times 1.25$$
$$\Rightarrow 7.5 + (2.4) - 10.00$$
$$\Rightarrow 9.9 - 10.00$$
$$\Rightarrow -0.1$$
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