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1808.7 = (9/5)*x+32 // - (9/5)*x+32
1808.7-((9/5)*x)-32 = 0
(-9/5)*x-32+1808.7 = 0
1776.7-9/5*x = 0 // - 1776.7
-9/5*x = -1776.7 // : -9/5
x = -1776.7/(-9/5)
x = 987.05555556
x = 987.05555556
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