What occupation is the principal source of compensable injuries in american workforce?

Manual materials handling is the principal source of compensable injuries in the American workforce. Manual materials handling is a process in which objects are moved or handled by pushing, pulling, lifting, carrying or holding. This activities poses several risks to employees and about 80% of the injuries it cause affect the back, hips, shoulders and necks.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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the supermassive black hole is in the middle of the galaxy.