Which units can be used to measure length or distance?

in metric system, millimeters, centimeters, meters, kilometers are the most often used units

US customary system, inch, foot, yard, mile are the most often used units

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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i don’t no. suiopgohjk