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(15-x)/4 = 10/2.5 // - 10/2.5
(15-x)/4-(10/2.5) = 0
(15-x)/4-4 = 0
(15-x)/4+(-4*4)/4 = 0
15-x-4*4 = 0
-x-1 = 0
(-x-1)/4 = 0
(-x-1)/4 = 0 // * 4
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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