Question

1) 7^х+1-2•7^х-2=341
2) 2^х-1+3•2^х-2+5•2^х-3=15

Answer 1

1) 7^x+1-2*7^x-2=341
7^x-2*7^x=341-1+2
7^x*(1-2)=342
7^x*(-1)=342
7^x=-342
2) 2^x-1+3*2^x-2+5^x-3=15
2^x+3*2^x+5*2^x=15+1+2+3
6*2^x=21
2^x=21/6