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x in (-oo:+oo)
20-((3*x)/5) = x-12 // - x-12
12-((3*x)/5)-x+20 = 0
(-3/5)*x-x+12+20 = 0
32-8/5*x = 0 // - 32
-8/5*x = -32 // : -8/5
x = -32/(-8/5)
x = 20
x = 20
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