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<span>9(2x --8) =5x-7
</span>step 1: simplify 18x - 72 = 5x - 7
23x = -79
step 2: solve it x = -3.43
There are a very large amount of possible solutions. A few examples.
10 + 10 + 10 + 10 + 10 + 1 + 1 = 52.
10 + 10 + 10 + 10 + (12 ones here) = 52.
10 + 10 + 10 + (22 ones here) = 52.
10 + 10 + (32 ones here) = 52
10 + (42 ones here) = 52
(52 ones here) = 52
I'm fairly sure those are all possible ways.
(85 + 60) ÷ 2 = 72.5 Close to 71%
Answer: D - 71%