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y in (-oo:+oo)
2.2*y-((y-7.3)/10) = 0.1 // - 0.1
2.2*y-((y-7.3)/10)-0.1 = 0
(-1*(y-7.3))/10+2.2*y-0.1 = 0
(-1*(y-7.3))/10+(2.2*10*y)/10+(-0.1*10)/10 = 0
2.2*10*y-1*(y-7.3)-0.1*10 = 0
21*y-1+7.3 = 0
21*y+6.3 = 0
(21*y+6.3)/10 = 0
(21*y+6.3)/10 = 0 // * 10
21*y+6.3 = 0
21*y+6.3 = 0 // - 6.3
21*y = -6.3 // : 21
y = -6.3/21
y = -0.3
y = -0.3
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