60x+80=100x combine like terms
80=100x-60x or 40x divide to get x by itself
80/40=40x/40
20=x
after 20 hrs
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<u>Step-by-step explanation:</u>



Answer:
71,788
Step-by-step explanation:
7 1 5 2 6
+ 2 6 2
____________
7 1 7 8 8
Because youre adding parts of the fraction and not changing the amount of parts the fraction is divided in to.