7ˣ⁺²+4*7ˣ⁻¹=347
7ˣ⁻¹(7³+4)=347
7ˣ⁻¹*347=347
7ˣ⁻¹=1
7ˣ⁻¹=7⁰
x-1=0
x=1
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Verified answer
7ˣ⁺²+4*7ˣ⁻¹=347
7ˣ⁻¹(7³+4)=347
7ˣ⁻¹*347=347
7ˣ⁻¹=1
7ˣ⁻¹=7⁰
x-1=0
x=1