Find out what number goes into 8 and 10 then figure out how many times that number goes into 100
0.5x + 78.2 = 287
-78.2 -78.2
subtract 78.2 on both sides you will then get 0.5x = 208.8 you will then divide by 0.5 and the answer is x = 417.6
Answer:
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2x + 12
