15 points solve arithmetic progession
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7(7a)=11(11a)
7(a+6d)=11(a+10d)
7a+42d=11a+110d
7a-11a=110d-42d
-4a=68d
-4a=0
68d=0
a=-4
d=-68
an=a(n-1)*d
18=-4(n-1)*-68
18=-4n+4*-68
18=72+4n
18-72=4n
-54=4n
-54/4=n
-13.5=n
7(a+6d)=11(a+10d)
7a+42d=11a+110d
7a-11a=110d-42d
-4a=68d
-4a=0
68d=0
a=-4
d=-68
an=a(n-1)*d
18=-4(n-1)*-68
18=-4n+4*-68
18=72+4n
18-72=4n
-54=4n
-54/4=n
-13.5=n
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