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(10*x-15)/5 = 2*t // - 2*t
(10*x-15)/5-(2*t) = 0
(10*x-15)/5-2*t = 0
(10*x-15)/5+(-2*5*t)/5 = 0
10*x-2*5*t-15 = 0
10*x-10*t-15 = 0
(10*x-10*t-15)/5 = 0
(10*x-10*t-15)/5 = 0 // * 5
10*x-10*t-15 = 0
10*x-10*t-15 = 0 // + -10*t-15
10*x = -(-10*t-15) // : 10
x = (-(-10*t-15))/10
x = (15-(-10*t))/10
x = (15-(-10*t))/10
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