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x in (-oo:+oo)
(x-(0.5*x))/0.12 = y // - y
(x-(0.5*x))/0.12-y = 0
(x-0.5*x)/0.12-y = 0
(0.5*x)/0.12-y = 0
(0.5*x)/0.12+(0.12*(-y))/0.12 = 0
0.5*x+0.12*(-y) = 0
0.5*x-0.12*y = 0
(0.5*x-0.12*y)/0.12 = 0
(0.5*x-0.12*y)/0.12 = 0 // * 0.12
0.5*x-0.12*y = 0
0.5*x-0.12*y = 0 // + -0.12*y
0.5*x = -(-0.12*y) // : 0.5
x = (-(-0.12*y))/0.5
x = 0.24*y
x = 0.24*y
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