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x in (-oo:+oo)
(15-x-7)/20 = 0.1875 // - 0.1875
(15-x-7)/20-0.1875 = 0
(8-x)/20-0.1875 = 0
(8-x)/20+(-0.1875*20)/20 = 0
8-x-0.1875*20 = 0
4.25-x = 0
(4.25-x)/20 = 0
(4.25-x)/20 = 0 // * 20
4.25-x = 0
4.25-x = 0 // - 4.25
-x = -4.25 // * -1
x = 4.25
x = 4.25
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