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20-((3/2)*x) = 5 // - 5
20-((3/2)*x)-5 = 0
(-3/2)*x-5+20 = 0
15-3/2*x = 0 // - 15
-3/2*x = -15 // : -3/2
x = -15/(-3/2)
x = 10
x = 10
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