[tex]\displaystyle 1)3^x*3=81\\3^x+1=3^4\\x+1=4\\x=4-1\\x=3\\\\2)2*2^x=32\\2^x^+^1=2^5\\x+1=5\\x=5-1\\x=4\\\\3)5*3^x=15\\3^x=3\\3^x=3^1\\x=1\\\\4)7*2^x=28\\2^x=4\\2^x=2^2\\x=2[/tex]
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[tex]\displaystyle 1)3^x*3=81\\3^x+1=3^4\\x+1=4\\x=4-1\\x=3\\\\2)2*2^x=32\\2^x^+^1=2^5\\x+1=5\\x=5-1\\x=4\\\\3)5*3^x=15\\3^x=3\\3^x=3^1\\x=1\\\\4)7*2^x=28\\2^x=4\\2^x=2^2\\x=2[/tex]