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x in (-oo:+oo)
(0.5*(x-3))/(-2) = 10 // - 10
(0.5*(x-3))/(-2)-10 = 0
(0.5*(x-3))/(-2)+(-10*(-2))/(-2) = 0
0.5*(x-3)-10*(-2) = 0
0.5*x+18.5 = 0
(0.5*x+18.5)/(-2) = 0
(0.5*x+18.5)/(-2) = 0 // * -2
0.5*x+18.5 = 0
0.5*x+18.5 = 0 // - 18.5
0.5*x = -18.5 // : 0.5
x = -18.5/0.5
x = -37
x = -37
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