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0.8/4 = (7-x)/8 // - (7-x)/8
0.8/4-((7-x)/8) = 0
(-1*(7-x))/8+0.2 = 0
(-1*(7-x))/8+(0.2*8)/8 = 0
0.2*8-1*(7-x) = 0
x-5.4 = 0
(x-5.4)/8 = 0
(x-5.4)/8 = 0 // * 8
x-5.4 = 0
x-5.4 = 0 // + 5.4
x = 5.4
x = 5.4
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