(1/2-5)²=1/3(79-x)

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(1/2-5)²=1/3(79-x)
x){PHN5eCs k[C}cnP&H;L277/.H̳80

(1/2-5)²=1/3(79-x)
(1/2-5)²=1/3(79-x)

(1/2-5)²=1/3(79-x)
73/4