1) "a_1=9,\\;\\; a_2=16,\\;\\;a_3=23,\\;\\;d=16-9=7."
"a_4=23+7=30,"
"a_5=30+7=37.\\\\\na_6=37+7=44,\\\\\na_7=44+7=51."
2)
"a_5=a_1+4d,\\\\\na_1=a_5-4d=7+9x-2x*4=7+x,\\\\\na_2=a_1+d=7+x+2x=7+3x,\\\\\na_3=a_2+d=7+3x+2x=7+5x."
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