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(x-75)/4.2 = 2.054 // - 2.054
(x-75)/4.2-2.054 = 0
(x-75)/4.2+(-2.054*4.2)/4.2 = 0
x-2.054*4.2-75 = 0
x-83.6268 = 0
(x-83.6268)/4.2 = 0
(x-83.6268)/4.2 = 0 // * 4.2
x-83.6268 = 0
x-83.6268 = 0 // + 83.6268
x = 83.6268
x = 83.6268
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