Example

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

Question

$$7 \times { 3 }^{ x+4 } +2 \times { 3 }^{ x+3 } -5 \times { 3 }^{ x+2 } \leq 192$$

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