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(13-x)/1.5 = x // - x
(13-x)/1.5-x = 0
(13-x)/1.5+(1.5*(-x))/1.5 = 0
1.5*(-x)-x+13 = 0
13-2.5*x = 0
(13-2.5*x)/1.5 = 0
(13-2.5*x)/1.5 = 0 // * 1.5
13-2.5*x = 0
13-2.5*x = 0 // - 13
-2.5*x = -13 // : -2.5
x = -13/(-2.5)
x = 5.2
x = 5.2
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