Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac { 2.1 \times 10 ^ { 3 } + 4.9 \times 10 ^ { 3 } } { 1.5 \times 10 ^ { 6 } }$$

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