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x in (-oo:+oo)
6-((3*x)/5) = 12 // - 12
6-((3*x)/5)-12 = 0
(-3/5)*x-12+6 = 0
-3/5*x-6 = 0 // + 6
-3/5*x = 6 // : -3/5
x = 6/(-3/5)
x = -10
x = -10
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