18(a-5)²-169=2(a-5)²-25
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18(a-5)²-169=2(a-5)²-2518(a-5)²-169=2(a-5)²-2518(a-5)²-169=2(a-5)²-25x
18(a-5)²-169=2(a-5)²-25
18(a-5)²-169=2(a-5)²-25
18(a-5)²-169=2(a-5)²-25
x=(a-5)^2
18x-169=2x-25
x=(169-25)/(18-2)=144/16=9
a-5=3 or -3
a=8 or 2